The King of Bluegrass played with the Father of Bluegrass, Bill Monroe, from 1949 to 1954, kicking off one of the most legendary careers in bluegrass. Here are 25 cuts from across that career: his hit Widow Maker; Don't Let Me Cross Over (with Little Jimmy Dickens); Rose of Old Kentucky (with Marty Stuart); Ruby (with Paul Williams); Darlin' Cory (with Ricky Skaggs), and more!