Okay, I'll list some faves. No particular order beyond the first four:
1) Paul Williams
2) Vincent Price
3) Joel Grey
4) Ben Vereen
5) Rich Little
6) Petula Clark
7) George Burns
8) Rudolf Nureyev
9) Bernadette Peters
10) Elton John
11) Lou Rawls
12) Julie Andrews
13) Peter Sellers
14) Roy Clark
15) James Coco
16) Helen Reddy
17) Lola Falana
18) Alan Arkin
19) Diana Ross
20) Gene Kelly
21) Loretta Swit
22) Paul Simon
23) Marty Feldman
24) Chris Langham
25) Carol Burnett
26) Roger Moore
27) Melissa Manchester
Could I make this list any longer? Probably inaccurate. Why don't I just put in some least favorite eps:
Jonathan Winters (he only does ONE ACT! What's the deal?!)
Anne Murray (kinda shoddy)
Star Wars (dumb)
Joan Baez (forced, preachy)
Senor Wences (I guess this one just didn't get to me; kind of boring, didn't really fit)
Wally Boag (same as Senor Wences)
Lena Horne (kind of boring, old hat, repeated jokes; lack of originality and Muppety anarchy)
Peter Ustinov (same as Lena Horne)
Leo Sayer (I'm a big Leo Sayer fan, but there are two main issues: opening & closing numbers should've been switched, so the show has somewhere to build and isn't downhill from the opening; and backstage area is empty and plot moves slowly/takes up too much time- needs some more regular features to fill in the gaps between Leo's high-energy rock numbers and the old-fashioned vaudeville solos)
Roy Rogers & Dale Evans (I dunno, I guess this one just didn't grab me)
David "Gorgon Heap" Ebersole