Where is the best place to get the most accurate NES sheet music?

I’m a new guy here that seeks with all my heart the sheet music to some of nintendos best game music. Especially the megaman music. I see on Galbadia Hotel there is sheet music(piano transcriptions), and it is really good, however it lacks some of the counterpoint/detail of the music.Is there anyway I can get a hold of the actual scores for the game music? If I cant find the actual music online, what are the chances of me getting the music from the actual composers? Where can I find a list on game composers for the nes games? How hard is it to contact them.
This messageboard seems very friendly and I would sooooo appreciate any help anyone can give me.Thank you.