It is interesting how often composers refer to Bach as the yard stick for quantity and quality. When it was suggested to Ennio Morricone that he was prolific he pointed out how much music Bach composed every week. When Randy Newman (who admittedly composes several film scores a year) apologises for only issuing one album of songs a decade, he always refers to Bach and the lovely Van Dyke Parks in the documntary about the Byrds (Under Review) says something like "everything comes back to Bach" - and now I think of it, Roger McGuinn shamelessly plagiarises Jesu, Joy of Man's Desiring for the tune of one of his songs.