I recall Edgar Winters White Trash opening for Emerson, Lake, & Palmer at a very trippy Fillmore East. White Trash annihilated ELP! And a practically empty My Fathers Place (mid-week) had Jazz band Winters Consort headlining with this skinny runt of a dude from Jersey opening. It wasn't even close, not too many bands in the country stood a chance against Bruce Springsteen and the E St. Band!!;)
Interesting/unusual concert pairings.
The Who as openers for Herman’s Hermits. Pretty much a failure. John McLaughlin and the Mahavishnu Orchestra opening for Zappa and the Mothers. Worked so well I attended in Milwaukee and Boston. McLaughlin and Zappa call and response noodling was spectacular. Roger Daltry did not join Peter Noone for a duet of, “Mrs. Brown you’ve got a lovely daughter “