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Bluegrass, a prominent element in Kathy Mattea's musical repertoire, is a genre characterized by its acoustic instrumentation and high-energy performances. It emerged from traditional American roots music and incorporates elements of folk, country, and blues. Bluegrass features intricate instrumental interplay, often centered around the banjo, mandolin, guitar, fiddle, and bass, and is known for its lively tempos and strong emphasis on vocal harmonies.