I'm compiling a list that is tentatively called Music Repeats Itself in Cycles of Approximately 20 Years. Here are some proposed entries:
Creed = REO Speedwagon
Incubus = Supertramp
The Banana Splits = GWAR
shakira = charo
Nickleback = Styx (based solely on hair)
Any suggested additions? Extra credit for reasonable Jethro Tull comparisons.