"This Night" by Billy Joel.
OK, boys and girls, back to the 80s: It was 1982 and Billy Joel had a brief romance with supermodel Elle Macpherson. She inspired him to write a 1983/84 doo-wop classic. The chorus is based on Beethoven's "Pathétique Sonata (Piano Sonata No. 8 in C minor)". Even though it is public domain, he credits "L. v. Beethoven" as co-composer. Killer sax work by Mark Rivera, whose father was Puerto Rican (man, those P.R.s are everywhere!). Song? Answer: "This Night" by Billy Joel. I had just about completely forgotten about this little gem until I heard it again as part of the score for the 2002 musical "Movin' Out", featuring Billy's music and choreographed by the magnificent Twyla Tharp. It has since become one of my favorite Billy Joel tunes. It takes true musical genius to convert the 2nd movement of Beethoven's Pathétique Piano Sonata into doo-wop but, doggone it, the pulls it off! https://www.youtube.com/watch?v=yR28C4__TXQ