Bill Monroe

William Smith Monroe (September 13, 1911 – September 9, 1996) was an American musician who created the style of music known as bluegrass, which takes its name from his band, the "Blue Grass Boys," named for Monroe's home state of Kentucky. Monroe's performing career spanned 60 years as a singer, instrumentalist, composer and bandleader. He is often referred to as The Father of Bluegrass.

source: Wikipedia