I used to compose loads of chiptunes myself but what Kaiju said is quite true about the pitch, it ends up harming your ears if you listen to it too much, it like pinches the eardrum or something, dont know how else to describe it. Its quite lowfi squeezed electric buzz, cant be good for the ears. Its sad because it lends itself perfectly for composing because of the freedom in dimensions (length of notes etc) Especially classical music and even sound manipulations are great with its instrumentation. Just dont ever use headphones like i used to, if you must listen to chiptunes.