Courtesy of the Clark Santee video archive, few songs have such impact as Jerry Jeff Walker's Mr Bojangles, a powerful song covered by Bob Dylan and Sammy Davis Jnr and delivered a global chart-topper for Nitty Gritty Dirt Band. At the dawn of the Seventies, a new breed of American singer/songwriters emerged, redefining popular music with classic songs reflecting the times. Jerry Jeff Walker (seen here in 1969) remains rightly regarded as amongst the very best of the bunch.