Aerosmith postponed at least one weekend concert after frontman Steven Tyler fell off the stage at a South Dakota show and suffered what a concert spokesman said were head, neck and shoulder injuries. Buffalo Chip hosted the Wednesday concert during which an amateur video showed Tyler spinning around before falling. A concertgoer said Tyler's head was bleeding and he was holding his shoulder after the fall, but it remained unclear Thursday how seriously he was hurt. The frontman was airlifted to Rapid City Regional Hospital, Sanborn said. A hospital spokeswoman would not confirm whether Tyler was there, and a representative for Aerosmith's publicity firm said only that the company was gathering information. The band's Friday concert in Winnipeg, Manitoba, was postponed. On June 28, Tyler hurt his leg at a concert in Uncasville, Connecticut, and the band postponed seven shows in July. Tyler also battled pneumonia before the tour began in June, while guitarist Joe Perry fought a knee infection. Tyler, whose performances often include swaying and grinding on microphone stands adorned with scarves, was dancing on a catwalk Wednesday night that was connected to the main stage. “He does a lot of dancing on the stage and he does a lot of stuff with his mike stand. He put his stand down and twirled around and stepped backwards off the stage,” Sanborn said.