He was the bass guitarist and a founding member[2] of the Minneapolis alternative rock band Soul Asylum.
In May 2004, Mueller, a longtime smoker,[citation needed] was diagnosed with esophageal cancer, and a benefit concert was held to help him with his medical bills.
[3] Paul Westerberg also made an appearance, as did Soul Asylum, in Mueller's last public performance.
In July 2006, Soul Asylum released The Silver Lining, a studio album featuring Mueller's last work.
Mueller was also pictured on the cover of the EP Clam Dip & Other Delights, released on April 14, 1989.