"BOOK OF LOVE (Who Wrote The Book)" Lead singer Charles Patrick heard a Pepsodent toothpaste commercial with the line "you'll wonder where the yellow went"/ "when you brush your teeth with Pepsodent", inspiring him to come up with, "I wonder, wonder, wonder who, who wrote the book of love". It was then work up into a song. The "boom" part of the song was a result of a kid kicking a ball against the garage while they were rehearsing. It sounded good, so they added it. "The Book of Love" was recor