We went to a small town on the weekend to listen to bluegrass music, and the sound of fiddles and mandolins was amazing.

bluegrass 是由 blue（蓝色）和 grass（草）组成的复合词。最初指肯塔基州特有的蓝绿色牧草，后来成为美国乡村音乐流派的名称，特点是使用原声弦乐器演奏，节奏轻快活泼。