Schlaumeier-Definition
"Bluegrass is polyphonic vocal and instrumental music played on certain unamplified instruments based on music brought from the British Isles to Apalachian regions and refined by additions of Negro and urban music. A Bluegrass band typically consists of a five-string banjo and guitar, together with a fiddle, Dobro guitar, mandolin, and bass fiddle (or any combination thereof). Vocal parts are rendered in the high-pitched style of traditional Britsh balladry, with chorus harmonies added by a 'high tenor' sung a third or fith above the lead, and lower baritone and/or bass lines."
Enzyclopaedia Americana
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