OK, more British Invasion: This Wine/Bayer Sager composition is based upon the Rondo movement of Clementi's Sonatina in G maj. op. 36 no. 5. First released by Diane and Annita in '65. Wayne Fontana and The Mindbenders' version hit #2 in the U.S. and the UK that same year. Phil Collins' cover was #1 in the U.S. and the UK in '88. #17 in my all-time makeout tunes hit parade!
Previous day's answer: Paul Simon's "An American Tune". That song has very special meaning for me as I came to the mainland in '73 - to this day I can't play it without getting all choked up (you know me, I'm a sensitive guy!).