OK, more Fabdom: Macca wrote this '65 "frantic rocker" inspired by his hero Little Richard. The B-side for "Help", it was never included in any of the original Beatles albums. Recorded on the same day as "I've Just Seen A Face" and "Yesterday"! Sir Paul used it to open his set during the 2001 "Concert For New York City" to benefit the surviving first responders of 9/11/01.
Yesterday's answer: "Livin' thing" by ELO.