William Smith Monroe September 13, 1911 - September 9, 1996)was an American mandolinist, singer, and songwriter, who created the bluegrass music genre. Because of this, he is often called the "Father of Bluegrass".

The genre takes its name from his band, the Blue Grass Boys, who named their group for the bluegrass of Monroe's home state of Kentucky. Monroe's performing career spanned 69 years as a singer, instrumentalist, composer and bandleader.

Over the next five decades, Bill Monroe led a band through which scores of talented musicians served their apprenticeship. Among Blue Grass Boys alumni who made their later mark in bluegrass, country, folk, and other genres were Clyde Moody, Howdy Forrester, Stringbean (David Akeman), Carl Story, Chubby Wise, Lester Flatt, Earl Scruggs, Benny Martin, Jim Eanes, Don Reno, Vassar Clements, Mac Wiseman, Jimmy Martin, Gordon Terry, Carter Stanley, Sonny Osborne, Bobby Hicks, Kenny Baker, Don Stover, Eddie Adcock, Dale Potter, Buddy Spicher, Del McCoury, Bill Keith, James Monroe (Bill’s son), Peter Rowan, Richard Greene, Byron Berline, Doug Green, and Roland White.

The sound that came to be known as bluegrass wasn’t born fully formed. It constantly evolved as Bill Monroe merged his creative inspirations with the talents that passed through his band.

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