The Songwriters Hall Of Fame will honor a rapper for the first time at its 48th annual induction ceremony: Jay Z. He headlines an induction group this year that also includes Babyface, producers Jimmy Jam and Terry Lewis; Top 40 hitmaker Max Martin; and the band Chicago’s chief songwriters, Robert Lamm, James Pankow and Peter Cetera. Motown founder Berry Gordy Jr., who deferred his induction last year, will also be honored. With its gesture toward hip-hop, the Songwriters Hall Of Fame follows the Rock & Roll Hall Of Fame in beginning to acknowledge a genre that has become a dominant mode in modern popular music. Linda Moran, the president of the Songwriters Hall Of Fame, said Jay Z was “so over the moon” about his induction. “He was flipping out, he was going crazy.”