Did you know that Steven Tyler is the new voice of professional bull riding? His song “Hold On (Won’t Let Go),’’ which is on his new solo album, is the official anthem for Professional Bull Riders, Inc., and will be played during PBR events and at the start of TV broadcasts on CBS networks. “The toughest 8 seconds in sports is staying on the back and riding that bull,’’ Tyler said in a press release on the PBR website.’’ The Aerosmith frontman recently met up with pro bull rider Nevada Newman, who said the rock legend was very down to earth.