"(Anesthesia)—Pulling Teeth" is a bass solo by Burton, accompanied on drums by Ulrich. A staple of Burton's live performances since his high school days in the band Agents of Misfortune, the instrumental track featured Burton's distinctive "lead-bass" style of playing, incorporating heavy distortion, use of wah-wah pedal and tapping. Bubacz introduces the track as "Bass solo, take one", informing listeners that the song was recorded in one take. "(Anesthesia)—Pulling Teeth" was the bass solo that Burton was playing when Hetfield and Ulrich first saw him at a gig. Hetfield stated: "We heard this wild solo going on and thought, 'I don't see any guitar player up there.' We were both counting the strings and I finally turned to Lars and said, 'Dude, that's a bass!' Cliff was up there on stage with his band Trauma with a wah-wah pedal and his huge mop of red hair. He didn't care whether people were there. He was looking down at his bass, playing." "Whiplash" was the album's first single, issued on August 8, 1983. It features a swift rhythm line of straight 16th notes played at about 200 beats per minute. Hetfield and Burton performed with palm muted technique and precise metronomic control. The lyrics celebrate crowd energy and headbanging. Rock journalist Mick Wall wrote that "Whiplash" signified the birth of thrash metal, stating: "If one wishes to identify the very moment thrash metal arrived spitting and snarling into the world, 'Whiplash' is indisputably it."