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. He was 88. Marshall was known throughout the music world for founding Marshall Amplification, which produced the amplifiers that rocked music halls and arenas after their introduction in 1960. (AP Photo/Chris Radburn/PA Wire) UNITED KINGDOM OUT

Associated Press
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. He was 88. Marshall was known throughout the music world for founding Marshall Amplification, which produced the amplifiers that rocked music halls and arenas after their introduction in 1960.   (AP Photo/Chris Radburn/PA Wire) UNITED KINGDOM OUT
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. He was 88. Marshall was known throughout the music world for founding Marshall Amplification, which produced the amplifiers that rocked music halls and arenas after their introduction in 1960. (AP Photo/Chris Radburn/PA Wire) UNITED KINGDOM OUT
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