Prince is the hands down #1! particularly since he mixed it up with covers ranging from Creedence to Queen!
But it's also always a good time when Aerosmith or Steven Tyler show up...

I first saw Aerosmith open for Black Sabbath at Madison Square Garden in 1975, and ended up working with the band in 1979-80. A wild ride to say the least, and I wrote it all down in "BABYSITTING A BAND ON THE ROCKS" (available at Newbury Comics locations throughout the Northeast and online at LTCDS.com > Webstore > Books). Also adventures with AC/DC, pink Floyd, Van Halen, jethro Tull, Billy Joel, Keith Richards and more...