This is a pretty cool site that allows you to listen to video game music which uses virtual emulation of the sound chip / sound fonts of the original machines. It is essentially like replaying the songs from the console itself and not a recording of the sound. Another interesting aspect of the site is its ability to replay each song as a multi track MIDI using the sound fonts. This essentially means that you can replay the song from a video game using the original sounds and also separate / mute each instrument during the playback. This can be used to sample or record parts of a video game soundtrack. This is especially useful if being used to remixes or as part of a video game which needs to add in or take away instruments from a song.
http://gamemusic.multimedia.cx/