sentences:  In 1975 this group made their first appearance at the Telluride Bluegrass Festival at Telluride, Colorado.New Grass Revival met at subsequent festivals in Telluride in the late 1970s and 1980s.The music of Strength in Numbers is influenced by the bluegrass virtuoso music of earlier artists Bill Monroe and the Bluegrass boys, and Lester Flatt and Earl Scruggs.