[1] This song is known for its fugal treatment of a jazz figure, described by one writer as "possibly the most complex instrumental music heard on Broadway to date".
[2] In the 1957 musical, the song is performed by Riff as he advises the Jets to stay cool before entering the Rumble.
Since the death of Riff (Russ Tamblyn), Ice (Tucker Smith) takes over as the leader of the Jets and he reasons with his team to play it cool.
[3] In 2011, actor Harry Shum Jr. performed the song as his character Mike Chang from the TV series Glee, in the third episode of season 3, "Asian F" (aired on October 4).
[4] An episode of Animaniacs features a parody version as "Coo Bird" sung by Bobby of The Goodfeathers.