Steins;Gate - Gate of Steiner - Piano
Aight well there are already better covers of this song up on YouTube but IDC cuz I love Steins;Gate and this OST :P. If you haven't watched Steins;Gate yet and you're even remotely interested in anime (why you on dis channel?) then check it out. Nao. There are a few mistakes and the beginning is a bit messy but whatevs. Enjoy!~
Sheet Music: http://ichigos.com/sheets/s
Scroll down to Steins;Gate, both transcriptions by FireWhale are the exact same :P.