Abba - Stockholm 8th May 1977
(Taken from the Summer 1977 edition of the Fan Club Magazine.)
Ella Fitzgerald - Madison Square Garden 1st December 1977
Pete Townshend - Wembley 9th December 1980
This extract is taken from queenlive.ca:
I also read Pete talking about it in his autobiography.Pete Townshend and his wife Karen attended the show. Pete later remarked, "I thought they were the maddest band I'd ever seen." He added that Queen were the only band in his eyes that took on the mantle of The Who by doing it their way with a brashness and Britishness that nobody else really had.