Geeks and TV critics alike knew Buffy was an innovative show willing to toy with expectations.  But nothing could prepare us for Once More, With Feeling, the Buffy Musical episode.  During Buffy’s sixth season, demon comes to Sunnydale causing its citizens to dance and sing like a old-fashion music, with harmonies and hidden orchestra.  Not only was the music explained in the story, but the episode dealt with major plot points, providing emotional moments enhanced by the enchanting music like "Under Your Spell" and "Life’s a Show".  Joss Whedon, in fact, wrote the episode’s music which, in this theater geek’s opinion, is some of the best music around.  Clubs around the country hold Buffy sing-along’s regularly in celebrating of the classic episode.  Watch for Whedon’s follow-up musical about super-heroes, Doctor Horrible.