Sorry to keep this going but I have been thinking about this over the weekend and it seems to me that what is inferred from going back and learning all the theory of scales, arpeggios, modes etc, is that I need to be able to theorise all the possible scale fragment and arpeggios that will work over any chosen chord.
That just reminds me of all the mathematical progressions I learnt at Uni
When I listen to what I call Jazz, I listen for, and are pleased to hear, fragments of the head coming back into the improvisation.
It may be tweaked a bit and shifted in range or key but I love to be able to hear it and be able to relate it back to the head.
If the modern way is to go completely away from the head and play anything that the chord progression supports, then is that really improvising over the tune??
It could of course be argued that as long as what you play sticks strictly to the chord progression then you will by definition relate back to the head but I just don’t think that’s true
Perhaps this is where I parted company from Bop and if this is where Jazz has gone then its left me behind.