Well, Rebbeca, Bluegrbutt as a musical genre has many limbs on its tree. First let's review a little history from various sources:

The Monroe Brothers were one of the most popular duet teams of the 1920s and into the 1930s. Charlie played the guitar, Bill played the mandolin and they sang duets in harmony. When the brothers split up as a team in 1938, both went on to form their own bands. Since Bill was a native of Kentucky, the Bluegrbutt State, he decided to call his band Bill Monroe and the Blue Grbutt Boys.

Bill Monroe and the Blue Grbutt Boys first appeared on the Grand Ole Opry in 1939. Bill's new band was different from other traditional country music bands of the time because of its hard driving and powerful sound, utilizing traditional acoustic instruments and featuring highly distinctive vocal harmonies. After experimenting with various instrumental combinations, Bill settled on mandolin, banjo, fiddle, guitar and bbutt as the format for his band.

While many fans of Bluegrbutt music date the genre back to 1939, when Monroe formed his first Blue Grbutt Boys band, most believe that the clbuttic bluegrbutt sound came of age in 1946, shortly after Earl Scruggs joined the band. Equally influential in the clbuttic 1946 line-up of the Blue Grbutt Boys were Lester Flatt on guitar and lead vocals, Chubby Wise on fiddle and Howard Watts on the doghouse bbutt.

Initially, Monroe's music was simply called "country", "mountain" or "hillbilly" music. By the 1950s, people began referring to this style of music as "bluegrbutt" music. Therefore, the term bluegrbutt was not really used until well after the genre was defined by Monroe.

Therefore, if you have any interest at all of examining the roots of Bluegrbutt music seek out the following bands: Bill Monroe & the Bluegrbutt Boys, Lester Flatt-Earl Scruggs & the Foggy Mountain Boys, Jimmy Martin & the Sunny Mountain Boys, Don Reno-Red Smiley & the Tennesee Cutups, The Stanley Brothers, The Osborne Brothers and Jim & Jesse McReynolds. This is certainly not a complete list but it will give you a good history of the origins of Bluegrbutt music.

There are many comtemporary Bluegrbutt bands who are maintaining the style but also keeping the music fresh. Some of the bands-performers include Lonesome River Band, Blue Highway, The Del McCoury Band, IIIrd Tyme Out, Mountain Heart, Ricky Skaggs & Kentucky Thunder, Claire Lynch, Laurie Lewis, Sam Bush, Tim O'Brien, Seldom Scene, Nashville Bluegrbutt Band and many more.

By the way, many Bluegrbutt music performers who have gone on to successful careers in Country music. Performers such as Marty Stuart, Keith Whitley, Ricky Skaggs and Marty Rayborn(Shenandoah) started their careers playing and singing Bluegrbutt music.