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Old-time: a pre-bluegrass string band style with country dance rhythms, including music from vaudeville, minstrel shows, British Isles folk traditions, early 78 RPM country recordings, old songs played on the fiddle, Appalachian modal tunes, and listening tunes unsuitable for dancing. Appalachian: a style of fiddling from the Appalachian Mountains of the United States that uses modal sounds and techniques. The Bluegrass genre remains intensely popular. Together and separately they became national stars they were sought after for radio, TV, national tours, mustic festivals, and movie soundtracks. They developed a hard-driving sound that incorporated anything that they heard that they liked: jazz, gospel, country, rock-n-roll. Not to be confused with Bluegrass, invented by Bill Monroe, a native of Kentucky, and the members of his band: Earl Scruggs, Lester Flatt, and Chubby Wise.
Like Irish music, it often uses modal constructs rather than keys. Old time and Appalachian music retains some of its Celtic roots, but it a unique style relying heavily on double stops (chords) and cross tuning (changing the pitch of the strings to facilitate drones and harmonics) and uniquely rhythmic bowing.