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It seems that Herold purchased an air horn from an old dump truck, planted it on his front porch facing the offending neighbors' home, ran a hose to an air compressor to power the thing (with a line to his living room, where he could control it) and proceeded to blare the horn repeatedly, in protest. Police arrived and he continued blaring the horn. He was arrested.
"I just blasted the [expletive deleted]. I didn't give a [expletive deleted]," Herold said.
It is worth reading the full story
. Unfortunately, it doesn't answer address what kind of hippie music was being played. String Cheese Incident? Umphree's McGee? Disco Biscuits? Leftover Salmon? More on this as the story develops.