Billy Joel and Jimmy Fallon Form a Two-Man Doo-Wop Group [VIDEO]

Here is a must-watch! Jimmy Fallon tests a new iPad app called "Everyday Looper" with help from Billy Joel and creates doo-wop magic on The Tonight Show Starring Jimmy Fallon.

If you're an Android User here is a link to their version "Looper"

Question: What song would you pick to doo-wop with one of them?