Back in the early 70's Buddy Guy and Junior Wells opened for Dave Mason at the Field House in Iowa City. Most of the people were gone in the middle of the first set of Dave Mason. No comparison. Dan
'they blew'em off the stage'
what concerts have you attended, where the warm up act blew the headliners away.....my examples...brownville station upstaging zz top to the point where people where chanting 'brownsville station!' during the littl ol' band from texas' set.....another..t.rex upstaging lynyrd skynyrd(yes there really was such a show), and the grass roots upstaging cream.