Which film soundtrack reintroduced roots American music artists to the public?

The film soundtrack that reintroduced roots American music artists to the public is "O Brother, Where Art Thou?" released in 2000. The soundtrack features a blend of bluegrass, folk, and traditional American music, showcasing artists like Ralph Stanley and Alison Krauss. It received critical acclaim and commercial success, revitalizing interest in these genres and artists. The album won a Grammy Award for Album of the Year, further solidifying its impact on American roots music.