Billy Joel, Jimmy Fallon sing with an iPad app (No, it's really good)

The talk show host, the great singer, and an iPad app called Loopy allow for music making of a spontaneously exalted quality.

The Tonight Show/YouTube screenshot by Chris Matyszczyk/CNET

Billy Joel didn't seem too sure at first.

One imagines he's a man of the old school: the dusty piano stool, the fool sitting in the corner talking into his beer.

He may be slightly less of a man for gizmos and apps.

Somehow, Jimmy Fallon, ever the boyish enthusiast, talked him into singing along with an iPad app called Loopy. This allows you to layer one track over another, so that you, too, can make like "Bohemian Rhapsody" (say).

Instead of "Bohemian Rhapsody," Fallon chose the "Boeem-a-weh" song. Yes, "The Lion Sleeps Tonight."

It might have all come crashing down. Somehow, it's curiously satisfying.

As they loop their loops, they manage a more than passable doo-wop impersonation.

True, Joel is a far better singer than Fallon. As, perhaps, are you. But he's generous enough to allow Fallon his moments without grimacing.

I fancy that, this weekend, the Loopy app will suddenly become very popular, just as many people will become unpopular with their neighbors.

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