McCartney. First melodic bass player thanks to his origins as a guitarist. The rest learned from him.
Paul Simonon - The Clash but never had the pleasure of seeing so can't count him in my list, but another close to my top 3 would be Chris Wolstenholme- Muse incredible bassist.
Martin Turner - Wishbone Ash. Tony Levin - King Crimson Bert Ruiter - Focus Greg Lake - King Crimson and ELP Roger Waters - Pink Floyd John Entwistle - The Who Obviously I have no idea how good any of these actually were but they played in some of my favourite bands .