In 1982, Trauma traveled to Los Angeles to perform at the Whisky a Go Go. Among those in attendance were James Hetfield and Lars Ulrich, both members of Metallica, which had formed the previous year. Upon hearing, as Hetfield described it, "this amazing shredding" (which later became "(Anesthesia) - Pulling Teeth"), the two went in search of what they thought was an amazing guitar player. When they learned that what they had heard was a bass solo by Burton, they decided to recruit him for their own band. They asked him to replace departed bassist Ron McGovney, and since Burton thought that Trauma was "starting to get a little commercial", he agreed. The idea of having to move to Los Angeles did not sit well with him, and said he would join only if the band would relocate from Los Angeles to his native San Francisco Bay Area. Metallica, eager to have Burton in the band, left their origin of Los Angeles to make a home in El Cerrito, a town located across the bay from San Francisco.