For shame, brown cheese is delicious.

David Bazan is pretty great.

You will want to look into learning harmonization and more importantly, counterpoint. This has been the text used since Bach for counterpoint. Otherwise, you can start here: http://www.musictheory.net/lessons

Analysis is huge as well. So track down some video game music scores and figure out the chord changes, leading tones, and whatnot.

Chiptune is a weird subset since there are only a few voices (three on a NES) and no polyphony but almost everything will carry over. Feel free to ask questions if there are things I can better explain.