The "Piano Man" Billy Joel, surprised a Long Island elementary school, by showing up to watch the young students perform a tribute concert. Can you imagine looking in the audience and seeing Billy Joel? According to reports on Twitter and in Newsday, the principal had this to say:

"We invited Billy Joel on a lark, but we didn't expect him to come. It was totally thrilling," said Nomi Rosen, Deasy's principal. "We were all beside ourselves."

Spotted: Billy Joel watching a Billy Joel concert on LI today — Newsday (@Newsday) April 9, 2014

Joel pulled up on a motorcycle 5 minutes before the concert and took a seat to watch the show. The concert was put on by kindergarteners, first graders and second graders.

How cool was that? Billy Joel listening to Billy Joel!