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 “
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@thecarpathian I actually saw Madonna once in Toronto. Not sure who I went with but I enjoyed the show and now have 1 of her albums in my collection.
Yyzsantabarbara, well she is world famous for a reason. Just not my cup of tea. Glad you enjoyed her concert.
In the 1970's, I saw Journey open for Emerson, Lake and Palmer -- Journey was not well-received.  Also saw Little Feat open for Electric Light Orchestra -- another odd combination but not nearly as poorly received.