If you like THIS....
....you REALLY should check out 1973's "Phantom Of The Paradise" with songs by Paul Williams(!) and directed by Brian De Palma! It predates Rocky Horror, and I actually like it better! Amongst all the great scenes: a trio of performers who sing in a completely different, flavor of the week style every time they take the stage. This includes a Sha Na Na like group, a Beach Boys group, and a musical number that's parodying Alice Cooper - which everyone leaps to the wrong conclusion of being Kiss, without doing the math....
It's Phantom Of The Opera meets Faust meets Picture Of Dorian Gray meets Rock And Roll! A bit dated now a somewhat cheesy even then, it still successfully combines black comedy, romance, Gothic horror, drama, and rock and roll musicals into a package that helped pave the way for BOTH Williams and De Palma's future work, which would immediately follow.
And hey, LEEMAN52 - the 'Alice Cooper Show' ISN'T professional?!? Why in hell's name would he be so emulated then?