I was lucky enough to be stationed in England (RAF Lakenheath) in East Anglia. Saw all kinds of groups, and concerts there in '71-'72 were really inexpensive, so, unless I was on duty, I'd check out shows. I was near Cambridge, a great college town. I've seen Pink Floyd a few times, and many others. One of the most memorable was Free, in a circus tent, during a coal miners' strike, so, generators. Yes, about four times, in England and the US. I've worked Mellencamp a half dozen times, Chicago a half dozen as well (Our theater was their first stop on tour for years. Reloaded semis three and four times. My first show as a stagehand was Cream in'68 just before I went into the service. Audept did tours forever. He'll have some serious stories---but he's under the strictest confidence to maintain silence. What happens on the road, stays on the road.