FILE - This Feb. 24, 2010 file photo shows musician Bob Weir at SIRIUS XM Radio in New York. Weir fell onstage while strumming his guitar at a concert in Port Chester, N.Y. Furthur has cancelled a tour date after guitarist Bob Weir fell onstage at a concert last week. Weir said on his website Tuesday that the band is unable to perform for the next several weeks ... due to unforeseen circumstances. They were scheduled to play May 9 in Napa, Calif.