Orijinal: I Guess That's Why They Call it the Blues Sheet Music by Elton John. Paul Honey. Elton John , Bernie Taupin , Davey Johnstone.
Tercüme: Paul Bal. Elton John, Bernie Taupin, Davey Johnstone. Elton John. Hal Leonard, Evrensel. İngilizce. 0-7119-7821-2. Solero.