I feel McCartney was much more "melodic" than Jamerson,McCartney played alot "behind" the beat, which is hard to put into type, I cannot describe it in mere words.... just my opinion, (no wrong or right answers).Chuck Rainey, and Carl Radle were fav's of mine too.Radle played in the "McCartney style". Beatles music writing changed with the times,they seemed to have that "sixth sense" when it came to writing timely masterpieces.