Individual Organ part. In the early cantata From the deep, Lord, cried I, Lord, to Thee BWV 131, Bach has the strings, voices and organ all notated in choir pitch, while the winds are notated in low chamber pitch. Bach's score is thus bitonal: the winds are in A minor, all the other parts in G minor. Any transposition of the score to a single key leads to compromises. For example, the choral bass in G minor is very low (up to C), but in A minor it is quite high (up to E2).