Someone seems to have done a full parody of Fiddler on the Roof as Shuggoth on the Roof.
Cthulhu, tentacles, and Arkham, all set to music. Seems pretty well done, too. Here’s a song entitled Tentacles, which gives a fair overview of Arkham:
And here is the song If I Were a Deep One. Nice parody of If I were a Rich Man. Love the lines where he is singing ‘blub blub blub’ so seriously…: