Ryan Seacrest, host of "American Idol" and a DJ on radio station KYSR L.A., is to replace Casey Kasem as host of Premiere Radio Networks' syndicated show "American Top 40." Seacrest takes over in Janu

Ryan Seacrest, host of "American Idol" and a DJ on radio station KYSR L.A., is to replace Casey Kasem as host of Premiere Radio Networks' syndicated show "American Top 40." Seacrest takes over in January.

Kasem, meanwhile, has signed a long-term deal with Premiere to continue hosting "American Top 20" in two versions: adult top-40 and AC.

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