Once More, with Feeling

Once More, with Feeling trivia questions

1. In Buffy season 6, episode 7, what compels Sunnydale residents to sing hidden truths?
2. Who wrote and directed Buffy season 6's musical episode?
3. On which U.S. network did Buffy season 6, episode 7 originally air?
4. In Buffy season 6, episode 7, how is the demon Sweet credited in the episode?
5. What made Buffy season 6, episode 7 the only one of its kind in the series?