Thank you ,
this is invaluable advice, but I have a few questions for clarification,
"which notes have a dominant effect in each bar."
Are you in anyway referring to Dominant fifths or do you mean the notes which are emphasised or in some other way give character to the bar.
"Essentially, it's a matter of using your ear, if it fits, you can play it, and sounds right, it is. The more you do it the easier it gets."
Does this mean that there are various combinations of the same chords that will work with music ?