Proudly displayed on the inside cover of Earth’s Earth 2 is a wide range of pills, perhaps the suggested prescription for the optimal listening experience: Earth plays music that blurs the line between song and pure sound—territory that is occupied by feedback and distorted guitars, and often not much more. Crawling at dirgelike (sometimes even slower) tempos and with little or no apparent sense of song structure, Earth stretches Black Sabbath-heavy riffs to their absolute noisiest extremes, turning fist-pumping heavy metal into trance-inducing ambience. Tonight, performing live for the first time in more than eight years, Dylan Carlson (Earth’s only constant member and mastermind) is joined by drummer Adrienne Davies in what is sure to be a mind-altering musical journey. The band plays with Stinking Lizaveta and Wooly Mammoth at 9 p.m. at the Velvet Lounge, 915 U St. NW. $8. (202) 462-7625. (Jacob Long)