ATLANTA — LL Cool J wants to make old-school hip-hop relevant for today’s listeners with a new Sirius channel. The two-time Grammy-winning rapper told The Associated Press that he will launch his new classic hip-hop channel called “Rock the Bells Radio” on Wednesday. He will host an invitation-only roller skating event to help launch the channel during a live broadcast in Los Angeles. LL Cool J hopes to create an avenue for old-school rappers to play their past songs and promote new work.