Recently I threw my Once More With Feeling CD in while I was out and about. This is not “great” music, and certainly the lyrics sometimes leave a bit to be desired. (My husband claims someone should have given Whedon a rhyming dictionary.) But it does what a musical soundtrack is supposed to do. It tells the story.
The Giles and Tara duet is probably my favorite piece (not just because they are the two best singers) because of the emotion involved and the traditional (as in musicals) way the audience is given to understand a difficult, character defining, decision.