John Mayer has helped spread holiday cheer by playing a private concert at a children's hospital in New York. The star performed at the 95.5 WPLJ-FM's 17th Annual Holiday Concert at Blythedale Children's Hospital in the Big Apple on Monday.

Mayer joined Matchbox 20 star Rob Thomas onstage for a rendition of Ben E. King's classic track Stand by Me.

The singer stayed to sign autographs for ill kids at the event, which raised an estimated $250,000 for the hospital.

(This news article provided by World Entertainment News Network)