Ralph McTell:
http://www.youtube.com/watch?v=Y0XgW-24-38
http://www.youtube.com/watch?v=qzkrzrxQPJc&feature=related
http://www.youtube.com/watch?v=Ohm-g5CuET4&feature=related
Irritating visuals (1974) http://www.youtube.com/watch?v=NpaMmztCuWw&feature=related