Neil Baldwin of Eurocom fame has been working on a website about this old NES music creations for quite some time and the music is nothing short of amazing.
Besides being the author for the music for the unreleased Hero Quest NES game, Neil Baldwin also worked on another Eurocom project to be released by Japanese publisher Video System - called Erik the Viking - a previously totally unknown NES game.
The game was some kind of Zelda clone and the game was nearly finished. But due to various misunderstandings between Eurocom and Video System the project came to a halt.
Sadly the near final ROM of Erik the Viking is no where to be found, but Neil has been kind enough to upload the music and I must say that the music is simply awsome... especially track 2 has a great vibe to it:-)
Anyway check out Neil's site here for more information and NES bleeps - http://dutycyclegenerator.com/.