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While I've browsed Google, Yahoo, Bing and Wikipedia, I can not find an answer about why. I've examined those sites of Taylor, Martin, Gibson, Fender and even more manufacturers and they also definitely don't discuss it. I can not even find anybody with a guitar online forum that has speculated about why. It was in the mid 70s how the annual music festival became famous. Due to their live performances at Pinkpop, many bands gained worldwide attention as well as some ones became world-famous rock acts. Some of these groups include: The Police, Pearl Jam, Rage Against the Machine, Red Hot Chili Peppers, Dire Straits, U2, REM, Sinead O?Connor, Lenny Kravitz, ZZ Top, Van Halen and UB40.