Mark Katz, a professor at the Peabody Conservatory of Music at The Johns Hopkins University, discussed his book, “Capturing Sound: How Technology Has Changed Music.” The event was sponsored by the Library’s John W. Kluge Center, the Music Division and the Motion Picture, Broadcasting and Recorded Sound Division. According to Katz, who teaches in the Department of Musicology at the Peabody, there is more to sound recording than just recording sound. Not just a tool for the preservation of music, the technology is a catalyst for change. In “Capturing Sound,” Katz writes a wide-ranging, informative and entertaining history of recording’s profound impact on the musical life of the past century, from Edison to the Internet.