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Today Bob Dylan makes his debut as DJ on XM Satellite Radio. He will host Theme Time Radio Hour, each installment organized around a different theme—today's theme is the weather. The New York Times ran a set list for next week's show, devoted to Mother's Day. More than a mere list of novelty songs, it demonstrates the deep and encyclopedic knowledge of roots music that has always informed Dylan's songwriting: Tommy Duncan, Buck Owens, Bobby Peterson Quartet, Ruth Brown, Carl Smith, Ernie K-Doe, Little Junior Parker, Jimmy McCracklin, and LL Cool J. The Times arched an eyebrow at LL Cool J. Perhaps the greying composer of "Positively 4th Street" is more sophisticated than the Grey Lady of West 43rd. Dylan will record the one-hour weekly show at home and on the road.