In Houston, between 1991 and 1992, there was a notable increase in the use of lean (also known as purple drank and sizzurp) which many believe contributed to the allure of screw music. The drug beverage has been considered a major influence on the making and listening of chopped and screwed music due to its perceived effect of slowing the brain down, and giving the slow, mellow music its appeal. In an interview for the documentary film "Soldiers United For Cash", DJ Screw denounced the claim that one has to use lean to enjoy screwed and chopped music, saying, "People think just to listen to my tapes you gotta be high or dranked out. That ain't true. There's kids getting my tapes, moms and dads getting my tapes, don't smoke or drink or nothing."