"rollo" was a piece of music that went along with the original suite, but zappa decided against putting the whole piece in the album. instead, he decided to add the main theme of "rollo" as the instrumental second half of "st. alphonzo's pancake breakfast". the entire suite appears in full on the live album "you can't do that on stage anymore, vol. 1", recorded at hammersmith apollo (hammersmith odeon), in london, on february 18–19, 1979. the piece by itself also appears on his posthumous album quaudiophiliac, and his posthumous live album imaginary diseases. the piece itself was written during zappa's recovery from injuries suffered in december 1971, when he was pushed from the stage at london's rainbow theatre by a deranged fan. the original piece had lyrics detailing the adventures of a "man and a dog" (the dog being named, "rollo") who encounter a couple in some sort of act of lovemaking. the piece was performed with the vocals during much of zappa's grand wazoo orchestra tour in september 1972. sometime after that tour, zappa decided to drop the lyrics and play it strictly as an instrumental; eventually finding its way into the yellow snow suite. in 1978, zappa resurrected and revised the lyrics (sung by keyboardist tommy mars) into the suite. rollo was performed on october 21, 1978 during zappa's appearance as host of "saturday night live". for the broadcast, tommy mars' vocals were modulated via a vocoder to avoid issues with network censors concerning the song's lyrical content.