Poison frontman Bret Michaels is latest artist to withdraw from Freedom 250 concerts
By Dawn Chmielewski LOS ANGELES, May 29 (Reuters) - Bret Michaels, frontman of Poison, the rock group best known for its working-class anthem “Nothin’ But a Good Time,” has withdrawn from a concert series commemorating the United States' 250th anniversary, the latest in a wave of cancellations.