Marshall Headphones: Festival attendees are invited to try Marshall Headphones while they wait to play mini golf. Marshall is a true rock legend. That uniquely clear and expressive sound combined with a mythical stage presence has enraptured music fans around the world for five decades. The legacy began in a small drum shop in Hanwell in the 1960s, where Jim Marshall sought to give a bunch of then-local guitarists the sound they wanted – a sound that was harder, crunchier and more rich. The result was the JTM45, an amp that reverberated with a sound that was much heavier than anything ever heard before. In a twist of rock and roll fate, those guitarists, much like the Marshall name, would go on to revolutionize music forever.