In light of the upcoming musical episode of Grey's Anatomy, my girlfriends and I were discussing other TV shows that have done musical episodes and I could not think of all of them. So I looked them up and compiled this list for your viewing pleasure. I did not watch most of these shows, but thought you might enjoy the clips.
Buffy the Vampire Slayer "Once More With Feeling": the entire town starts spontaneously bursting into song and dance, some people are dancing so much that they burst into flames. It turns out that someone had summoned a demon that is causing all the chaos:
That 70's Show "That 70's Musical": Fez imagines song and dance numbers while preparing for a school concert
Scrubs "My Musical": a patient with a brain disorder hallucinates that everyone in the hospital is singing
How I Met Your Mother "Girls vs. Suits": this was not an entire episode, just one song, and was part of Barney's imagination when asked by a hot girl to give up his suits
Northern Exposure "Old Tree": a pregnant Shelly wakes up one morning in her own musical
Pushing Daisies and 30 Rock also did musical episodes, but the Pushing Daisies clips could not be embedded and I could not find any useable clips for 30 Rock.
Even some of the popular cartoon series have done musical episodes including Daria, Futurama, South Park and several episodes of The Simpsons.
I am a little nervous about the musical episode of Grey's Anatomy. I have a feeling it is going to be a huge train wreck. Hopefully, I am wrong and it will be FABULOUS :o) We will just have to wait and see!