Turning 80 today, B.B. King continues to prove he hasn't lost a guitar lick or a vocal chop. A professional musician since his early 20s, when he abandoned sharecropping in Indianola, Miss., and headed north for Memphis, Tenn. to play the blues, Mr. King has recorded more than 70 albums. On his latest, "80," the bluesman has recorded 12 duets — with Van Morrison, Eric Clapton, Elton John, Bobby "Blue" Bland, Roger Daltrey, Gloria Estefan, Sheryl Crow, Darryl Hall, Mark Knopfler, Glen Frey, Billy Gibbons and John Mayer. Each track is distinctive and features Mr. King's signature guitar work and...