Fast Times at Buddy Cianci Jr. High - S4-E2
Factual error: At the end of Peter's trombone solo, he holds out his last note. While holding the note, he moves the slide with no change to the note whatsoever. Since the pitch of the trombone is controlled by the slide, it would be impossible for Peter to move the slide as much as he does without changing the pitch he's playing. (00:02:00)
Chosen answer: It's a real song called "Elvira". Originally by Dallas Fraizer in '66, however, this version seems to be the Oak Ridge Boys cover version. However, the mega lesbians skip the verse and just sing the chorus after the opening line.
Bishop73