( In this Jan. 11, 2003 file photo, Dick Clark greets singer Christina Aguilera during rehearsals for the American Music Awards in Los Angeles. Clark, the ever-youthful television host and tireless entrepreneur who helped bring rock `n' roll into the mainstream on \"American Bandstand,\" and later produced and hosted a vast range of programming from game shows to the New Year's Eve countdown from Times Square, died of a heart attack on Wednesday, April 18, 2012. He was 82. (AP Photo/Mark J. Terrill,)
