I just looked through some threads, and people here seem like don't know how to convert MIDI file into sheet music. If you can find the MIDI file of the song you like, then you can just simple use OVERTURE to open the midi file. Whatever comes out is the sheet music. Very easy.

Here is the download of OVERTURE 3.10
http://www.popiano.org/popiano/33445211.asp?id=2054

It's a very simple music program, just like Mozart or other compose music program.