This term "bluegrass" comes from the name of the musical group led by Bill Monroe: The Blue Grass Boys, whose name itself is inspired by the nickname of the state of Kentucky (the Bluegrass State). Bluegrass is largely derived from old-time music, which has its origins in the traditional ballads and songs of England, Ireland, and Scotland that 18th-century migrants brought with them to the Appalachian region. Zoom in on this musical style.