I'm not doing at all well even though I have now got the theme.  Only four done after several hours.  I was hoping for more hints on here, but think I may have left my brain behind today.  I started after the quick crossword and lunch as usual after a busy morning of chores, but kept falling asleep.  I asked my husband (the musical one) for a Schubert prelude but he only knows of one.  He's keen jazz fan too, so I'll see if he can shed any light on that clue.  He's given me a couple of Bohemian composers, but I can't see how they fit in, so I guess it is more cryptic than that.
I'll be back in a bit if I haven't given up.