Cibo Matto is a group made up of two Japanese women singers, Yuka Honda and Miho Hatori, Timo Ellis on Drums, and Sean Lennon, son of John Lennon and Yoko Ono, on bass guitar. They disbanded in 2011, but soon got back together again for several fundraisers sponsored by Yoko Ono, including a benefit for the Japan Earthquake survivors. Their blog is Here and you can read more Here.
Both songs found in this episode are included on the 1997 album Super Relax
Cibo Matto played at the Bronze in Episode One of Season Two - "When She was Bad." In that episode (written by series creator Joss Whedon) Buffy is still reeling from her encounter with the evil Master Vampire in Season One that left her literally dead until discovered underground by Angel and Xander, who brought her back to life with CPR. Despite a summer away from Sunnydale with her well-meaning father, Buffy comes home acting sullen and quiet, plagued by nightmares and dark thoughts of death. Buffy mistreats everyone close to her, not just Cordelia who deserves it, but Xander who is still in love with her. In a famous scene, Buffy acts like a bitchy femme fatale, making both Angel and Willow jealous while she dances with Xander, whom she also torments by coming onto him sexually. The background music to all this is Cibo Matto's otherworldly sound.
It's such an interesting plot twist to have the superhero behaving badly, and it works to humanize Buffy, who is physically strong but often emotionally vulnerable.
The two songs by Cibo Matto in this episode are "Spoon" and "Sugar Water."
One more interesting note: during the dance sequence, a man who looks very much like the vampire Spike dances in front of the band while watching Buffy and Xander. This predates the arrival of Spike later in Season Two, Episode 3 - "School Hard". And it isn't Spike because the same young man appears in the final classroom scene, ironically sitting in front of Buffy's desk, and in the sunlit classroom - so definitely not a vampire either. It's quite possible thought that Joss Whedon was foreshadowing Spike early in the season - he knew William the Bloody was coming to Sunnydale, after all, and this guy has exactly the same hair. Maybe the make-up artist was practicing, LOL.