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What was Uncle Tupelo's legacy?
Uncle Tupelo is credited as one of the founders of the alternative country genre, a blend of alternative rock and traditional country music.
What made Uncle Tupelo become credited as founding the alternative country genre?
Uncle Tupelo's sound was unlike popular country music of the time, drawing inspiration from styles as diverse as The Minuteman's hardcore punk and Hank Williams's country instrumentation and harmony.
What song was Uncle Tupelo's most popular?

Question: what are they most known for
Self-contained rewrite: What are Uncle Tupelo most known for?