Glenn Underground is one of the deepest of the deep house producers, following Larry Heard's classic Chicago tracks with his own earthy grooves, more closely aligned to the spiritual tones of disco than even contemporary house music. In fact, his bootleg remix of the prototype disco single -- Donna Summer's "I Feel Love" with production by Giorgio Moroder -- is virtually a necessity in the crates of house DJs. The head Underground has recorded for nu-school Chicago label Cajual/Relief (as GU) plus Europeans like Peacefrog, DJAX-Up-Beats, SSR, and Guidance. He often watched his uncle's band practice while growing up in Chicago, and began playing with the group's keyboard, a Fender Rhodes. He began DJing and also started producing tracks on tape as early as 1991 to mix in at his gigs.