The music makes this scene 20% more disturbing. ESPECIALLY 0:40 0_0.

Unfortunately the voices are heavily embedded in all channels of the audio, so this isn't a very clean BGM rip. You can still hear Pinkie Pie and her... "guests"... talking. Sorry. (Though if you listen to it without watching the video, the quiet voices in the background make it creepier).

Music by William Anderson. From S1E25, "Party of One," of My Little Pony: Friendship is Magic. MLP copyright Hasbro.

Do you want an official MLP:FiM original soundtrack release? Hasbro will likely only consider it if they see the support (and therefore potential sales) for an OST release. So sign the petition! (and if they do release it you better buy it - Pinkie Pie is watching - ALWAYS watching)
http://www.petitiononline.com/p1nk13pi/petition.html
The more fan support, the better the chance of it happening!