Jim Marshall is the greatest rock n roll photographer EVER - PERIOD! He was respected by the musicians and was allowed to get close when no one else would be. He has taken some extraordinary shots of iconic figures such as Jimi Hendrix, Jim Morrison, The Beatles, Janis Joplin & the list goes on and on. He would be the first person to be invited to take shots of festivals such as Woodstock. His work speaks for itself...
the link to rolling stone magazine has a nice article on him plus a link to a slide show of some of the best 60s & 70s musicians. I've also added Jim Marshall's website as well....
http://www.rollingstone.com/rockdaily/index.php/2010/03/24/jim-marshall-legendary-rock-photographer-passes-away-at-74/
http://www.marshallphoto.com/
R.I.P. Jim Marshall