Diabolus in Musica
Learn the theory behind the devil's music.
Medieval monks banned the tritone. Metal built an empire on it. Understand the theory inside heavy riffs and solos, explained so simply anyone can get it, with interactive tabs you can see, hear and play along to.
Theory without the boredom
Theory you can hear and play
Every concept is applied straight to the fretboard with original riffs in the style of rock and metal. See the notes, hear them, and play along at your own tempo.
Interactive, not passive
You do, you do not just read. Tap out rhythms, drill technique to a metronome, improvise over backing loops, and build progressions you can hear.
Explained for humans
No conservatory jargon. Short lessons in a clear order, from your very first note all the way to writing your own solos and songs.
Learn by doing, not watching
Tap the rhythm
Hear a rhythm, tap it back against a metronome, and get scored on your timing.
Technique trainer
Loop a lick, ramp the tempo up as you clean it, and turn control into speed.
Solo lab
Improvise over a backing loop with the scale and target notes lit up on the neck.
Interactive fretboard
Click to find notes, then build chord progressions and hear them ring back.
Your journey, eight courses deep
- 1Guitar Zero: hold it, tune it, your first chords and strum
- 2Reading & Rhythm: the pulse, note values, syncopation
- 3Fundamentals: notes, intervals, the tritone, chords, progressions
- 4Technique: bends, legato, tapping, sweep and more
- 5The Dark Side: pentatonics, scales, sevenths, first modes
- 6Diabolus Unleashed: all the modes and improvisation
- 7Lead & Soloing: phrasing, target notes, build a solo
- 8The Forge: composition, write your own music 😈
Questions before you start
Do I need to read sheet music?+
No. Diabolus teaches everything on the guitar fretboard with tabs you can see and hear. There is even a whole course on reading rhythm, but you never have to read notes on a staff to play.
I'm a complete beginner. Is this for me?+
Yes. The path starts from absolute zero, rhythm and what a note even is, and builds up one small, clear step at a time through seven courses. No prior theory needed.
Do you use real songs?+
No. Every riff, lick and backing is original, written in the style of rock and metal. You learn the exact same theory and feel, without any copyright baggage.
What makes it interactive?+
You play, not just watch. You tap rhythms back against a metronome, drill technique licks at a tempo you control, improvise over backing loops with the scale mapped on the neck, click the fretboard to find notes, and build progressions you can hear.
Is it free?+
There is a full free tier that takes you from rhythm and your first note through the fundamentals and core technique. The deeper courses (advanced harmony, all the modes, lead soloing and composition) are premium. No credit card to start.
Is it in Spanish?+
Yes. Every lesson and exercise is available in English and Latin American Spanish (es-MX), and you can switch anytime.
Ready to make theory your superpower?
Free tier available, from rhythm to your first riffs. No credit card required.
Enter Diabolus