With the help of an iPad app, Billy Joel and Jimmy Fallon formed a two-man doo-wop group and performed “The Lion Sleeps Tonight” on “The Tonight Show."

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Billy Joel and Jimmy Fallon form 2-man doo-wop group
With the help of an iPad app, Billy Joel and Jimmy Fallon formed a 2-man doo-wop group and performed 'The Lion Sleeps Tonight' on 'The Tonight Show.'