From the liner notes of The Complete Collection And Then Some...
: Manilow was originally reluctant to record this song, saying to Arista Records chief Clive Davis, "This 'I Write The Songs' thing Clive, I really don't want to do it." Manilow says his worry "was that the listeners would think I was singing about how "I" write the songs, when it was really about the inspiration of music. Clive understood, but didn't think it would be a problem. "Besides," he told me, "You DO write songs!" Manilow says he was concerned about coming off as a gigantic egomaniac, but that he liked the song so much he decided to record it. He adds, "Whenever I heard the song in public, I felt the need to run to everyone who was listening and say, 'You know, I'm really not singing about myself!'"
Judy - Melbourne, Australia