"Cash was never a great singer in a technical sense: he hadn't much range, his pitch often wobbled, and his lack of breath control sometimes found him grasping for sound at the end of lines. But he was a great singer in the sense of projecting a persona through his voice; his emotional range, which went from a Sinatra-like swagger to an almost embarrassingly intimate vulnerability, was as wide as the spread of notes he could hit confidently was narrow. Such a singer doesn't really lose that much with age; in fact, he gains even more interpretive depth".