Here's a piano version of Tridashie's Friendship is Musical Intro.
So, let's TriDance !!! :)
Thankies a lot to Tridashie and Minty Root (links below).
It is the "Cupcakes video" song (sorry, haven't watched it, too hardcore for me...). It's called "Ready to die" by Andrew W.K.
I wanted to transcribe the music in "A Tridashie performance" video by Minty Root but it appears that Tridashie (and so Minty Root) took it from that video from Lukegi88 so I have to give him the credits ;) :
https://www.youtube.com/watch?v=3sKkqBolWZo

Here's the link to Tridashie's channel:
https://www.youtube.com/channel/UCVv1vQYLgJ6STMJkK2aWMyQ
and Minty Root's:
https://www.youtube.com/user/Playerdotexe

The sheet music and the MIDI are available on my Musescore account : https://musescore.com/user/15049186/scores/5051462

I hope you guys will like it,

Ponily Yours,

PaperoPony