PetraGuard

12 Tone Matrix Creator

Free online twelve-tone matrix generator for serial composition. Type or pick a 12-tone row to fill the matrix with every prime (P), inversion (I), retrograde (R), and retrograde inversion (RI) form. Play any row or column, or print a score with random rhythm.

Fill in the pitches you like and choose sharps or flats. Click a blank cell to pick from the unused pitches, or type and use the arrow keys.

Click a P, I, R, or RI label to hear that row or column played with a random rhythm. The corner play button loops every row and column in a random order and direction.

Twelve-tone matrix of prime, inversion, retrograde, and retrograde-inversion row forms
 
 
 
 
 
 
 
 
 
 
 
 
 

Lowest note when playing

Octave
Time

Each row picks a random floor between G3 and G4.

PetraGuard Software ยท free 12-tone matrix and other music tools