If you're in need of authentic NES-style audio for your project, try the music of The Game Creator's Pack, containing nine full-length music pieces in a variety of genres! Also included are five short, multipurpose jingles. With the musical diversity included in this pack, I'm certain that you can find a suitable piece or two for your games and works.
Preview the music included in the pack here: https://soundcloud.com/jonathan-so-988423341/sets/the-game-creators-pack-audio
Download options for the pack include uncompressed WAV format and 320 kbps MP3 files.
I made these assets Creative Commons-Zero because I believe anyone with the imagination for creating games should be able to produce them without worrying about graphic or audio production. If you want to make games, download The Game Creator's Pack here: