Any Ideas?

I've been chewing on this since the weekend. Anyone want to join in?
Updated version. Thanks to everyone who has helped so far.

Updated at 15.25
Thanks to everyone for your help. Final two are 9 across and 23 across.
17 across is serenade


Update at 15.35
FINISHED! Thanks to everyone for their help - especially Auslaender and Barkerchal who were particularly active!