Music Theory

Name a chord from its notes (C E G Bb, A C E G): best name, inversion and alternative names; first note is the bass.

Spell a chord from its symbol (Cmaj7, F#m7b5, G7b9, Dsus4, C/E): notes, intervals, semitones and MIDI numbers.

Frequency in Hz to the nearest note, MIDI number and offset in cents; adjustable A4 reference; tuner-style result.

Interval between two notes (quality, number, semitones) or the note a given interval above or below a note.

Key signature (sharps or flats), circle-of-fifths neighbours, relative and parallel keys for any major or minor key.

Note name (C#4, Bb3) or MIDI number to MIDI, frequency in Hz and wavelength, with adjustable A4 reference pitch.

Roman numeral analysis of a chord progression in a key: numerals, inversions, borrowed chords, secondary dominants.

Spell a scale or mode on any root: major, minor, modes, harmonic and melodic minor, pentatonic, blues, whole tone.

BPM to milliseconds for note values, dotted and triplet delay times; or average tap intervals into a steady BPM.

Transpose a chord progression by semitones or from one key to another, with spelling that fits the target key.