Christiaan Van Heemert's channel on youtube has insightful and concise nuggets appearing pretty darn regularly. In case there is anyone out there who hasn't subscribed yet here is the latest.
This one on coherency is really helpful. I had noticed something similar in my own soloing at times but never systematized the process like Christaan does here - a very useful approach to practising so as to be freer when we're soloing over progressions.
Episode 4 on "colour up, colour down" I also found very insightful.
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Episode 4 on "colour up, colour down" I also found very insightful.