"My Country Tis of Thee" was featured in the Season Three episode, "World Wide Recorder Concert".
Background[]
This song is identified as the music to be played by four million third graders on their recorders, in a form of a concert taking place in Arkansas. On the night before the concert, the boys altered the music sheet to include the Brown Note and place them outside the hotel room of the New York Kids, as an act of revenge for being humiliated by the latter. However, one of the organizers picks it up, believing that Yoko Ono has changed the music again, and gets this "new revision" distributed to everyone.
The note is eventually played during the concert, causing everyone to defecate uncontrollably.