Help with legal music downloads

I am supplying music for a memorial service coming this Saturday.
I was given a list of Songs needed...Unfortunately, this persons musical taste
was SO divergent from Mine, I have pretty much NADA in my collection. And I have a lot of music!

I was considering Joining one of the Legal download sites, and purchasing
the songs individually.

any recommendations from any of you? Itunes? Rhapsody?
Who has the biggest catalog? best prices etc..
and, are there any caveats to joining one site, over another?

Thanks in advance to all you tunefreaks!

Space

Well, thanks for all your help! LOL..
Must have been that word "legal" hehe..
I managed to collect everything together legally, and have burned the CD's needed.




[edit on 17-3-2006 by spacedoubt]