Wilco rose from the ashes of the seminal roots rockers Uncle Tupelo, who disbanded in 1994. While Jay Farrar, one of the group's two singer/songwriters, went on to form the band Son Volt, his ex-partner Jeff Tweedy established Wilco along with the remaining members of Tupelo's final incarnation, which included drummer Ken Coomer as well as part-time bandmates John Stirratt (bass) and Max Johnston (mandolin, banjo, fiddle, and lap steel). Guitarist Jay Bennett rounded out the group, which in 1995 issued their debut album, A.M., a collection of spry country-rock tunes that followed the course established in Tweedy's earlier work. Wilco's sophomore effort, 1996's two-disc set Being There, marked a radical transformation in the group's sound; while remaining steeped in the style that earned Tweedy his reputation, the songs took unexpected detours into psychedelia, power pop, and soul, complete with orchestral touches and R&B horn flourishes. Shortly after the release of Being There, which most critics judged to be among the year's best releases, Johnston left the group to play with his sister, singer Michelle Shocked, and was replaced by guitarist Bob Egan of the band Freakwater. At the same time, while remaining full-time members of Wilco, Stirratt, Bennett, and Coomer also began performing together in the pop side project Courtesy Move. In 1998, Wilco collaborated with singer/songwriter Billy Bragg on Mermaid Avenue, a collection of performances based on unreleased material originally written by Woody Guthrie.