RPG maker. Also, if you can make 8-bit stylish music (the game Has a very retroish look) them sure!
Alright. I've sort of upgraded to MIDI, but since you want 8-bit, I'll start composing 8-bit music again... None of my 8-bit stuff was good, so bear with me, it's probably going to take a while... Are there any particular songs you need right now?
Also, with RPG Maker, I heavily suggest using MIDI, despite the lack of that 8-bit sound (it's still retro-ish. It's 16-bit), since it's a hell of a lot easier to loop. Maybe I'll make a MIDI and .WAV for each song?