12
age he started
4
instruments
4
genres played
1
app built
At 12, Elías heard someone play a chord on piano. Not a song — just the chord, hanging in the air. Something clicked that didn't unclick. He's been chasing that feeling across four instruments ever since.
Piano came first, then bass, guitar, and drums — each one because he wanted to understand harmony from a different angle. Not collect instruments, just hear things differently.
Bass became the main one. Partly by accident — bands always need a bassist — but it turned out to be the best music theory class he never paid for. The bass player can't hide. You have to know exactly which chord is happening, where the root sits, and what's coming next. Get that wrong, and the whole band notices.
Years of playing pop, R&B, worship, and jazz in real bands made chord progressions feel less like theory and more like a language. The kind you stop translating in your head and just start speaking.
"Every article on this site was written with a bass in my hands at some point."
The frustrating part was that every tool for learning chord progressions was built for people who already knew a lot. Too academic, or too shallow. He wanted something you could open in a browser, drop in a ii–V–I, and hear what the theory actually sounds like — in thirty seconds, no account, no tutorial. So he built Chord Sequence.
The Instruments
🎹
Piano
Where it started. All voices at once — harmony as a whole picture, nothing hidden.
🎸
Bass
Main instrument. Forces you to understand roots, movement, and intention — or the whole band falls apart.
🎵
Guitar
The humbling one. Same chord, twelve different voicings, each with its own personality.
🥁
Drums
The reason progressions feel alive instead of academic. Rhythm is where theory becomes music.
Watch Me Play
About Chord Sequence
Chord Sequence is a free, browser-based chord progression builder — no account, no install, no credit card. Open it, add chords, hit play. It supports 37 chord types, 13+ rhythm styles with real audio samples, real-time transposition, and WAV export ready to drop into any DAW.
Everything runs in your browser. Your progressions stay in local storage until you export them — nothing is sent anywhere. It works offline after the first load.
Try the app Elías built
Free, no account needed. Build chord progressions and hear them instantly.
Open free Chord Player