Chicago-born soulster Lou Rawls was one of the most popular and versatile singers in pop music during the 1960s and '70s. His distinctive baritone, as well-suited to pop and jazz as it was to straight soul, formed a seductive blend of silk and gravel, and made a fan out of, among others, Frank Sinatra. Rawls lent his unique style to some of the biggest names in the music business, including David Axelrod and Gamble & Huff. His later career was marked by occasional acting gigs as well his work with the United Negro College Fund. When Rawls died of lung cancer in early 2006, the music world lost a genuine treasure.