That is quite true.

Firstly, I have no musical theory, so looking at musical notes-dots etc is as much use as me trying to read cantonese.When I get given a tune to learn, I do it by ear, on guitar for the most basic chords, majors/minors etc, but, many tunes have much more in them than just basic chords. More complex than just normal basic chords, hearing these is one thing, knowing what they are is something else. Also, if I want to make the tune more ornate, then I again do it by ear, fitting what (normally) sounds right. But I believe, a chord can be determined by the notes of the dots. But that is where I am fick