Details These 24 preludes and fugue pairs – one in each of the major and minor keys of the chromatic scale were written in 1950/51 and are considered one of the of the greatest examples of music written in all major and/or minor keys.Published by Edition Peters. Contents-No. 5 D major-No. 9 E major-No. 2 A minor-No. 3 G major-No. 4 E minor-No. 7 A major-No. 1 C major-No. 8 F sharp minor-No. 10 C sharp minor -No. 11 B major-No. 12 G sharp minor-No. 6 B minor