If you share my feelings on this issue please share your thoughts. My feeling is that for all the Sheet Music I write I write it off the top of my Head as well as Lyrics and then I play the Music Notes and Chords on Guitar.I am Poetic Weavel therefore I write Poetry and Play Guitar
My Feeling is that if it is has Feeling and Passion and is from the HEart and Sounds Good then Whoo cares.
As far as being taught how to Play never have to date nor am I self Taught I just play the Guitar and comes out fine each time.