This handy application provides pitch references for musicians and singers. It's a chromatic pitch pipe, ideal for a cappella singers and timpanists. With thirteen pitches, each a half step above the previous, Pitch Pipe provides all of the notes of a single octave, so a singer can start in any key required by Western music. To use, play the initial key note or tonic of the piece to be sung. You can also play the first sung note of the song, articularly when the song begins in unison.