In the 1970s, Joseph Saddler was not just a witness to the birth of hip-hop -- as Grandmaster Flash, he was one of its creators. He, with the Furious Five, became the first hip-hop act to be inducted into the Rock and Roll Hall of Fame, after his "cuttin'" technique created a pioneering standard for up-and-coming DJs. See this founding father in action tomorrow at the 9:30 Club. Doors open at 11 p.m. The venue is at 815 V St. N.W., Washington. Tickets are $20. Call 202-265-0930 or go to 930.com.