What are the Buffy episodes that giles sings in?

In "Buffy the Vampire Slayer," Giles sings in two notable episodes: "Once More, with Feeling" (Season 6, Episode 7), where he performs "I've Got a Theory" and "Bunnies," and "The Gift" (Season 5, Episode 22), where he sings a brief part of "The Gift." His musical contributions are memorable highlights that showcase his character's depth and emotional range.