This photo dated March 1, 2010, shows Jim Marshall of Marshall Amplifiers in Milton Keynes, England. Jim Marshall, who helped shape the sound of rock and roll with his groundbreaking amplifier designs, died Thursday April 5, 2012. (AP Photo/Chris Radburn/PA Wire)

Photo by: Chris Radburn

This photo dated March 1, 2010, shows Jim Marshall of Marshall Amplifiers in Milton Keynes, England. Jim Marshall, who helped shape the sound of rock and roll with his groundbreaking amplifier designs, died Thursday April 5, 2012. (AP Photo/Chris Radburn/PA Wire)