I saw Kate Bush in the 70s in Mannheim. The music was probably fine, can't remember, but the whole concertt was choreographed to the nines and there was absolutely no audience interaction or even recognition that there was an audience there. She may as well have sent a videotape.
About the same time and at the same venue I saw Elton John. I went straight after work to get a good (free) parking space. As I passed the back of the Rosengarten Concert Hall, I saw him going down the steps to the back entrance. Just him with a small briefcase, arriving 2-3 hours before kick-off. He was, and, I think, is still, pretty conscientious.
In those days, he only had the Greatest Hits, and it was a rollicking evening. About 40 years later saw him again - still a great entertainer. By the later date I wasn't so interested in his music any more but it was such a good show, you couldn't help but enjoy it.