During my college years, I had an inexplicable obsession with MIDI files. When everybody else was looking for higher quality MP3 files, I took some odd pleasure in stuff that sounded like old Nintendo games. In hindsight, the old Nintendo memories may be the reason I like them so much. There's even a Bad Midi Museum that's been around for years. Just for the sake of doing it, here are some more 8-bit sounding songs - Most of them from Guitar Hero, Rock Band and the like...
Megadeth's Hangar 18 8-bit
Metallica's Master of Puppets 8-bit
AC/DC's Thunderstruck 8-bit
And Metallica's One 8-bit (This sounds like you've just entered the wrong level in the original Zelda).
And finally, if some snotty music critic really reviewed your Guitar Hero Performance.