Lucas Mendes

My online training through Berklee introduced me to the fundamentals of production, recording, arranging, audio, and composition. The course alone does not solve an instrument-related question. Study has to become an explanation you can check: playing a four-bar sequence, hearing a bass change, comparing two grooves, or identifying the moment when your hand loses the pulse.

I also bring 12 years of practical experience in music production. During that time, I learned that a problem rarely appears by itself. A chord may seem wrong because your hand changed position on beat three, because the change interrupted the pulse, or because the key does not suit the voice. That is why I separate technique, theory, and application in Cantivy lessons. You do not need to memorize every name before playing. First, make the movement. Then, name what happened.

When I explain a progression such as I–V–vi–IV, I show the function of the scale degrees and suggest a test in a comfortable key. In C major, for example, the sequence is C–G–Am–F. You can play each chord for four beats at 60 BPM, repeat eight times, and then increase to 72 BPM. This example is for studying the relationship between the degrees, without reproducing a complete chart from a copyrighted work.

When I discuss tuning, I also describe the tool’s limits. The low E on a guitar is close to 82.41 Hz, but a browser tuner depends on the device microphone, room noise, the distance between the source and the phone, and the quality of the captured signal. A reading of 82.41 Hz can guide practice, but it is not a laboratory measurement. If the television is on, a fan is running loudly, or several strings are vibrating at once, repeat the reading in cleaner conditions.

This combination of study and testing defines my work. I do not treat a concept as finished simply because it has a familiar name. I ask how you apply it, what error may occur, and which sign shows that the performance has gone off track.

The work begins with a briefing. I define the main question, the reader’s level, the instrument involved, and the expected result. “Learn a rhythm” is too broad. “Play a groove at 60 to 72 BPM for four bars, keeping the thumb on the pulse without interrupting the count” creates a target you can test.

Then I organize the lesson as a sequence of actions. First comes instrument preparation. Next, I present the pattern at a reduced speed. After that, I show a common error and propose a measurable correction. If the exercise is in 4/4 at 70 BPM, you can count “1, 2, 3, 4” for eight bars, record 30 seconds, and check whether the tempo speeds up during the changes.

If the idea involves harmony, I use scale degrees, intervals, and small examples. A I–V–vi–IV progression can be transposed to G major as G–D–Em–C, without turning the text into a complete chart for a copyrighted song. If the topic involves Brazilian rhythm, I describe the subdivision, accents, and point of entry. A country practice can begin with two alternating chords for four beats; a pop accompaniment can be isolated before the complete performance; a worship accompaniment can be studied with the right hand playing muted strings.

In the writing, I cut instructions that do not help with your hand’s next movement. I also look for real examples from styles readers play, such as a country groove, a pop subdivision, a folk accompaniment, a common worship cadence, or a chord change used in rock. The goal is not to pile up references. It is to show where the skill appears and how you can isolate it in a 5-minute exercise.

The published articles undergo clarity, sequence, and consistency reviews before going onto the site. I check that the text uses the same name for the note, chord, tempo, and rhythmic pattern throughout. When a lesson requires a tool, I explain what it does, what it does not do, and under what conditions it should be used.

Before publishing, I check chord names, intervals, notes, scale degrees, time signatures, and key examples. I also test the count whenever a tempo marking is included. If the exercise calls for 4/4 at 70 BPM, the instruction must match what you hear: four pulses per bar, approximately 0.86 seconds between pulses, for the indicated passage.

A sequence written as I–V–vi–IV should follow the same logic in any key, as long as the degrees are respected. In C major, it can be C–G–Am–F. In G major, G–D–Em–C. This check prevents a theory explanation from looking correct on paper while producing a different sequence when you take the exercise to guitar, keyboard, or an accompaniment app.

I also check whether the explanation fits the instrument. A six-string guitar instruction should not assume keyboard fingering. A keyboard lesson needs to indicate register, position, or interval when these change the result. A vocal lesson needs to consider breathing, range, volume, and comfort. An exercise designed for a medium voice should not be presented as a rule for every voice.

For a tool, I test the available browser workflow. The tuner requires the page to be open and depends on the device microphone. Noise, distance, access permission, and signal quality affect the reading. For a more consistent test, leave a single sound source active, bring the device close without touching the instrument, play one note at a time, and wait 2 to 4 seconds before interpreting the result.

I also perform an editorial review. I look for sentences that could create two interpretations, undefined terms, and instructions without a stopping rule. The question is simple: can you tell what to do, for how long, and how to recognize improvement? If the answer is no, the text goes back for editing. The site tools are support, not substitutes for your ear, a metronome, or guidance from a professional.

You can apply this same check today. Before playing, write down four details: instrument, key, tempo, and exercise duration. After playing, record one observable problem, such as “the change to F is late on beat four” or “the pulse rises from 68 to approximately 76 BPM.” This record makes the next attempt more objective.

My experience covers music production, instrumental practice, arranging, editing, recording, and teaching through text. It does not cover every school, every instrument, or every stage situation. A suggestion that works on a steel-string guitar may need adaptation on a nylon-string instrument. An exercise designed for a medium voice may not suit someone with a different range. A setup that works on one instrument may worsen the response of another.

I also do not provide medical, speech-language, or technical diagnoses for equipment that has not been described precisely. Pain while playing, persistent hoarseness, hearing loss, and physical discomfort require evaluation by a qualified professional. If pain appears after 10 minutes of practice and does not disappear when you stop the exercise, stop playing. If hoarseness lasts more than 14 days, seek medical or speech-language evaluation. An online lesson does not replace an in-person assessment.

If the problem involves electricity, internal maintenance, or a risk to the equipment, stop the test. Do not open a power supply, amplifier, or electric instrument without technical knowledge. Unplug the device and seek qualified assistance if there is a burning smell, unusual heat, a spark, or a damaged cable.

There are limits to the information itself. I can analyze a chord progression or explain a rhythmic subdivision, but I cannot promise that one approach will be best for every recording. The result depends on the instrument, room, microphone, technique, and musical goal. An arrangement for voice and guitar calls for different decisions from a backing track for a country band, a worship playback, or a country recording with programmed drums.

When I am not confident enough, I identify the uncertainty, look for an appropriate source, or make clear that the recommendation is a starting point. You can test this boundary by dividing the question into two parts: what is verifiable, such as the approximate frequency of a note, and what depends on choice, such as the best inversion for a specific recording.

Errors can happen on a page involving notes, numbers, equipment names, browser versions, and performance examples. When I identify a problem, I correct the affected passage and review the related sections. A note outside the key can change the entire demonstration. An incorrect unit can cause you to adjust equipment improperly. An incomplete count can shift the chord entrance. For that reason, I do not treat a correction as a visual detail.

Corrections may come from my own review, a later check, or a reader’s message. To evaluate a suggestion, I compare the claim with practice, consult reliable material when necessary, and check whether the change applies generally or only to one example. I do not change a lesson simply because someone has a different personal preference. First, I separate fact, method, and taste.

If a page gives a frequency, tempo, or formula, I check the number and unit. If it gives a chord progression, I check the degrees in the stated key. If it describes a tool, I repeat the workflow with the page open and verify the required permissions. This process reduces the risk of correcting one sentence while leaving the same problem in a title, list, or frequently asked question.

When a change affects the meaning of an instruction, I update the content and clearly record the correction on the page when necessary for understanding. You can check the collection of texts and updates in the published articles. If you find a note, measurement, link, or explanation that seems incorrect, send the context through contact. A message with the instrument, tuning, key, tempo, and exact passage speeds up the investigation.

To send a correction today, copy the problematic sentence, indicate the expected result, and describe what happened in practice. “The chord is wrong” is not enough. “In G major, the sequence listed as I–V–vi–IV appears as G–C–Em–D, but the expected fifth degree is D” provides a verifiable point.

You can contact me to report an error, suggest a topic, or explain where a lesson stalled. Tell me the instrument, the exercise you tried, the tempo at which you practiced, and the result. “It didn’t work” helps very little. “On a six-string guitar in standard E tuning, at 68 BPM, the chord changes before beat three and the right hand stops for half a second” already makes it possible to investigate the instruction.

Also include the key when chords or vocals are involved. For a question about a worship accompaniment, say whether you are in C, G, or another key. In a country groove, explain whether you are using a pick or your fingers. In a pop practice, describe whether the problem appears in the muted strum, thumb, or anticipation. These details help distinguish coordination difficulty, an arrangement choice, and a possible error in the text.

I also accept suggestions connected to Brazilian repertoires and concrete needs. You can request an explanation of country, baião, xote, pagode, MPB, or worship accompaniment grooves. I do not send complete lyrics or full charts for copyrighted works. I can work with analysis, scale degrees, rhythm, key, structure, and original exercises.

The correct channel is the contact page. For general questions about publication, see about Cantivy. If you want to practice without waiting for a response, open one of the free lessons, choose a tempo between 60 and 72 BPM, and record 30 seconds of your attempt. The recording reveals problems that go unnoticed while you play, such as speeding up during changes, noise between chords, or losing the count after the second bar.

Before sending your message, make three identical attempts. Use the same tempo, key, and passage. Note whether the problem appears in all three. This small check prevents an occasional mistake from being confused with a consistent difficulty.

My work at Cantivy combines studio practice, online training through Berklee, and 12 years of experience in music production. Every lesson should lead you to a verifiable action without hiding technical limits or turning a preference into a rule.

Use this summary before starting a practice session. It helps you choose a lesson, check a tool, and send a question with information that truly matters. You do not need to study for an hour to obtain useful data. Five minutes with a steady count and a short recording already show where the performance changes.

If you have your instrument in your hands right now, start small. The goal is not to finish a page knowing everything. It is to leave it playing one specific thing with more control. Choose four bars, practice at 60 BPM for three repetitions, and increase to 66 or 72 BPM only if you can keep the pulse without stopping.

• Set a concrete target, such as playing four bars at 70 BPM, repeating eight times, and maintaining the count in 4/4.
• Check the instrument, tuning, key, tempo, and count before practicing.
• Break a country, pop, rock, or folk rhythm into one simple layer before adding mutes, anticipations, and variations.
• Use the tuner with the page open and consider the influence of the microphone, distance, and noise.
• Play one note at a time when using the tuning tool and wait 2 to 4 seconds before interpreting the reading.
• Prefer analysis, scale degrees, and progressions over complete reproductions of copyrighted lyrics or charts.
• Record 30 seconds of practice to check speeding up, pauses, and noises you did not notice during the performance.
• Write down the exact point of your question before sending a message through the contact page.