Rollins was Black Flag's longest-lasting vocalist. When he joined Black Flag, he brought a different attitude and perspective than previous singers. Some earlier songs, such as "Six Pack" (a song written about original singer Keith Morris) blended a sense of black humor with driving punk rock. Rollins was an intense performer, who usually appeared onstage wearing only shorts. Ginn once stated that after Rollins joined, "We couldn't do songs with a sense of humor anymore; he got into the serious way-out poet thing."