John Martyn

John Martyn, OBE (11 September 1948 – 29 January 2009) (born Iain David McGeachy) was a British singer-songwriter and guitarist. Over a 40 year career he released 21 studio albums, working with artists such as Eric Clapton and David Gilmour. He has been described by The Times as "an electrifying guitarist and singer whose music blurred the boundaries between folk, jazz, rock and blues".

source: Wikipedia