Bobby Sichran was an alternative hip hop musician who has been compared to an American singer whose six-minute single "Like a Rolling Stone", recorded in 1965, enlarged what?
Bobby Sichran: Bobby Sichran (real name Robert Lichtman, died February 2015) was a Jewish-American alternative hip hop musician. Bobby Sichran:  Others have compared him to Bob Dylan, but Sichran criticized such comparisons, saying that he would "never want [his] music to exist on comparisons to someone else." Bob Dylan: Bob Dylan ( ; born Robert Allen Zimmerman, May 24, 1941) is an American singer, songwriter, musician, painter, and writer. Bob Dylan:  Leaving behind his initial base in the American folk music revival, his six-minute single "Like a Rolling Stone", recorded in 1965, enlarged the range of popular music.
the range of popular music