#1
Could anyone recommend me some? i hear bach is good for bass, but any others? Thanks.
#2
Ave Maria, Für Elise, Moonlight Sonata, Boureé, Suite No. 1 in G major. Thats all I could think of right now.
Conklin GTBD-7
Digitech JamMan
Guitar Rig Mobile
Korg AX10B
#3
Ride of Valkyries (Wagner), In the Hall of the Mountain King (Grieg) both sound great on Bass.

And of course you could always check out this book:

http://www.bassbooks.com/shopping/shopexd.asp?id=469
#4
Stu Hamm has arranged a version of Moonlight Sonata for bass.