Cthulhu Round-up.

A Shoggoth on the Roof
"There are some things that man was not meant to adapt to musical theatre, and A Shoggoth on the Roof has long been regarded as a musical that cannot and must not be produced. Since 1979, every attempt to produce this monster of a musical has ended in disaster, horror, agony and madness. Yet in spite of this hellish track record, seldom does a month pass when the HPLHS doesn't hear from some intrepid band of thespians who think they have what it takes to put A Shoggoth on the Roof. Most are never heard from again. If you're crazy enough to consider the notion, we want to hear from you."

Yes, combining Fiddler on the Roof and Lovcraft's Cthuluian Mythos gives you... Shoggoth on the roof! (I always said Cthulu was Jewish anyway; It was the curly nine-dimensional, many-angled hair that gave it away...)

Edit: Better though, is this astounding Abba parody "Do you hear the pipes, Cthulhu?"

"Do you hear the pipes, Cthulhu?
They were being played by shoggoths on the shores of Carcosa
Can you hear our prayers, Cthulhu?
Deep in sunken R'lyeh waiting for the rightness of a star?
Where the Deep Ones worship Dagon, Mother Hydra in sea chambers built afar?"

Grab the MP3