joko - // i wondered if this could be the reason someone with such amazing & varied musical abilites had issues of control with his singing? (he could write & read music & play almost any instrument extremely well. he also wrote & played classical music) //
The ability to write and play music, and the ability to sing, are not connected.
The world is full of musicians at the highest level in their field, including pop and rock, who couldn't carry a tune in a bucket.
Similarly, some of the world's top pop and rock vocalist would not know one end of a guitar or piano from the other.
I can tell you the difference between a Fender Stratcoaster and Gibson Les Paul just by listening to them, but I cant play a note on a guitar.
I interview musicians for a variety of technical websites, and I know masses of technical information about drums, basses, acoustic, and electric guitars, and I interview rock and pop singers for magazines as well, but i can't sing or play a note.
As I say, skill in one area, doesn't give you skill in another.
Something the BBC should learn when it takes ex-footballers with God-given skills on the field, and puts them in a studio as a 'pundit' when they can barely say their own name.