We are all familiar with the tunes and songs from our life times, but it all began way back with the old "Country" songs of the US that morphed into Country & Western, R&B, Blues,Rock & Roll and latterly Pop. Throw a little Jazz and Swing in and we are up to the here and now. But without some of these early performers non of it was possible. The protest song movement of the 60s was indeed directly descended from some of them.