JJ Cale signed Troubadour album. 12x12 inches vinyl included John Weldon "J. J." Cale (December 5, 1938 July 26, 2013) was an American guitarist, singer, songwriter and sound engineer. Though he avoided the limelight, his influence as a musical artist has been widely acknowledged by figures such as Mark Knopfler, Neil Young, Waylon Jennings, and Eric Clapton, who described him as "one of the most important artists in the history of rock". He is considered to be one of the originators of the Tulsa sound, a loose genre drawing on blues, rockabilly, country, and jazz.