...well, I just signed up for the Yahoo! Music Unlimited service and it seems to have a limited amount of songs available.

I wanted to listen to all of Muse's newest tracks and they have none! They have 14 Muse songs and they're all old tracks.
I just checked out Rhapsody and they have 97 Muse tracks.

So while Yahoo is cheaper, it's not really any good if they don't have the songs you want to listen to.

I wouldn't mind paying the higher fees for Rhapsody, so this is actually good news.