I cringe to mention this instrument , not because I don't like the instrument . I think it's nice , but I am primarily a big fan of string instruments.
That said , my girlfriend likes classical music and she is learnign how to play piano classical style . She's even going through the royal conservatory grades , and she will probably finish before I do because she has more formal training , and her sight reading is pretty good.
Anyways , I've always wanted to compose some duet pieces for us because we can't find a whole lot of repertoire for the piano and classical guitar.
My guess is because of the volume .
That said , are their any composers who have composed duet pieces for guitar and piano. And could give some good advice and general principles.
Formally speaking , I won't be studying how to compose until grade 6 conservatory level I believe , but I don't think it hurts to start researching and try
learning in small baby steps.
In terms of theory . I am just going through refresher on preparatory rudiments, but I hope to finish basic in a year from now.