When did you see Alice Cooper, Jethro Tull, and The Kinks?
I saw Alice 3 times: Dec.1971 at Pirate's World in Dania,FL (that was the "Killer" tour), then twice on the "Billion Dollar Babies" tour (at the Spectrum in March 1973 and again at Pirate's World in April 1973). I don't recall there being an opening act at any of those shows.
Also saw Tull 3 times (all at the Spectrum): May 1971 (Tony Joe White opened, followed by Spirit, then Tull). In May 1972 their opening act was Wild Turkey, a band formed by former Tull bassist Glen Cornick. The last time was October 1972 with Capt. Beefheart opening. Have seen Ian Anderson a few times as a solo in the past five years.
I saw the Kinks twice. First time was at the Spectrum in Nov.1971. Edgar Winter's White Trash was the middle group, and there was a distinctly forgettable group that opened (can't remember their name)
Second time was an outdoor concert at the Allentown Fairgrounds Racetrack in Aug. 1972. Orleans opened the show, followed by the Kinks, with the Beach Boys as the headliners. Have seen Ray Davies as a solo twice. I've also had tickets to see Dave Davies as a solo twice, but each time his show was cancelled...most recently about 2 weeks ago!
One other concert I forgot because it wasn't a real "group"....Bob Dylan's "Rolling Thunder Revue" which was sort of a travelling caravan of musicians that included Roger McGuinn (from the Byrds), Mick Ronson (from David Bowie's band) and a bunch of others...saw that at Brandeis University in Nov. 1975