The first instance of lyrics being written for the melody is on a 1965 demo tape by The Mothers Of Invention on which the song is recorded as "I'm So Happy I Could Cry." The lyrics describe the sincere love of a man to a "girl he left behind him when he went out to see this great, big world". This version, released on the posthumous Frank Zappa album "Joe's Corsage", also contains a bridge section that is not included in any other version of the song, save for the instrumental version that appears at the end of the "Lumpy Gravy" LP. At one point, the tune (without lyrics) was referred to by a working title of "Never On Sunday" (coincidentally the title of another very popular and oft-recorded song by Greek composer Manos Hatzidakis, written around the same time that Zappa wrote his song).