If you aren't already aware of this veteran jazz/blues guitarist's Youtube channel with loads of deconstructions of their music, by all means, check it out. Mike has been performing and recording for decades (18 solo albums), as well as with artists ranging from Phil Keaggy to Micky Dolenz. Like so many others, his life was changed on the evening of February 9th, 1964. Much of the what he absorbed beginning then became the basis for his career, which he now shares in the form of informative videos.  In this discussion, he offers his insights into what The Beatles' primary guitar players were up to and the basis of their brilliance.  Check out MikePachelli.com, and his most recent project - High Standards - which features Tony Levin and Danny Gottleib.