I would spotlight to index not only music files on my hard drive, but also the iTunes library.
Background: I have a MacBook air with limited space. In order to be independent from physical burdens, I decided to migrate my music library to Bitcasa, which I primarily use to stream my data on demand. Spotlight is not capable of indexing this network drive. The only way I could access my songs quickly via Spotlight search I can imagine now is indexing my iTunes library, which contains all songs also on my Bitcasa network drive.
What is your solution?