Pi

Pi is a song that was sung in "Backyard Hodge Podge". Linda was hallucinating that her failed pies were singing in a musical number.

Lyrics
Pie 1:  ♪  Three-point-one-four-one-five-nine-two...

  ♪ Pies 1 & 2:  ♪  Three-point-one-four-one-five-nine-two... ♪

Pies 1, 2 & 3:  ♪  Three-point-one-four-one-five-nine-two...

♪ ♪  Piiiiiiiiiiiiii! ♪