Free · in your browser · no microphone
Transpose chords
Type a chord sequence, pick how far to move it or which key it should land in, and hear it played in the new key. For singers who need it lower, guitarists with a capo and horn players reading a concert part.
What this does
It moves every chord by the same number of semitones and names it the way the new key does: in D you get F♯ and C♯, in F you get B♭, never A♯. The key is read from your first chord (Am means A minor); change it in the picker if your song starts somewhere else. Twelve semitones up or down is the same chord again, so the slider stops at eleven.
The play button plays each chord as a plain three-note triad with a low root, one after the other, so you hear where the song now sits before you sing or play it. Sevenths and added notes are kept in the written result but left out of the sound.
Trumpet, clarinet, sax and horn
A B♭ trumpet, clarinet or tenor sax reads two semitones higher than concert pitch: concert C is their D. An E♭ alto sax reads nine semitones higher (a major sixth): concert C is its A. An F horn reads seven higher: concert C is its G. The presets do the sum both ways, from a concert chart to your part and back.
The capo hint
Guitarists often keep the shapes they know and move the capo instead. Moved up one to seven semitones: put the capo on that fret and play the chords you typed. Moved down, or further up: the tool looks for the fret where the most chords fall on open shapes (C, D, E, G, A, Am, Dm, Em) and tells you which shapes to play there.
Then make something of it
"Hear the roots in a track" sends the root of each chord into Brumm as a melody, inside a club track with a beat and a bass. No account, no upload: the notes travel inside the link itself. Hum a line over it there, and it becomes an instrument.
Nothing you type leaves your phone: the tool works in the browser and keeps nothing. How the site counts visits.