a long and formulaic sectional composition ranging through all 24 keys which was intended for an enharmonic keyboard with both 31 notes per octave and pure major thirds. Finally, a lost collection by Johann Pachelbel (1653-1706), Fugen und Praeambuln über die gewöhnlichsten Tonos figuratos (announced 1704), may have included prelude-fugue pairs in all keys or modes.

It was long believed that