Johnny Cash -- $8 million
Like Ray Charles, the "Man in Black" enjoyed newfound popularity posthumously. The Oscar-winning movie Walk the Line greatly increased interest in the country singer-songwriter. In 2006, he sold 3.6 million records, up from 2.8 million the year before. Cash's estate offers a steady stream of compilations, never-before-heard tunes from the song vault, and remastered versions to keep fans coming back for more, even after his passing in 2003.