What really helped me:
Try to think in terms of the chord at first, not the key, and even leave other scale notes for weaker beats of the measure or passing tones(those terms are covered in the material referenced above)..think about out-lining the chord using accepted rules(#1 root on beat 1) There is an excercise in which you write out the arpeggio for each chord on each beat and "connect the dots". This is an oversimplified explanation but hopefully someone with chime in with a source for this excercise..this is a good one!
Also, your "pulse" or rhythm is JUST as important as your note selection, you are the wheels that the car is driving on..METRONOME
Try to think in terms of the chord at first, not the key, and even leave other scale notes for weaker beats of the measure or passing tones(those terms are covered in the material referenced above)..think about out-lining the chord using accepted rules(#1 root on beat 1) There is an excercise in which you write out the arpeggio for each chord on each beat and "connect the dots". This is an oversimplified explanation but hopefully someone with chime in with a source for this excercise..this is a good one!
Also, your "pulse" or rhythm is JUST as important as your note selection, you are the wheels that the car is driving on..METRONOME