>>105
Hi fren.
Just learn music notation, scales, chords and what arrangements are (in that order). You do not need any specific books, even youtube stuff suffices (I learned myself with a "The complete idiot's guide to music theory" book); the important thing here is for you to understand the concepts. Have a piano at hand to play stuff you learn, so you can begin to associate sounds with concepts, that way you will be able to understand how it all works; try an online piano if you do not have a real piano, a guitar is just way too complicated to learn theory well. Knowing all of that should be enough for you to be able to "read" music as if it were a language; notation, scales, chords and arrangements are what music is made with.
If you want to compose you can learn melodic function and harmonic function. Those are mere guidelines though..
