Ha! We're up to duos and trios now :D
Not much to add really though :(
Five duos:
Powell/Wisefield in Wishbone Ash (I agree with Philly, sorry Ted, I do like your playing too, but...)
Gorham/Robertson in Thin Lizzy (other pairings were good, but that's the one for me)
Medlocke/Hargrett in Blackfoot
Angus/Malcolm
Papa George/Stevie Simpson (not sure how many outside London will have come across these guys, but a few years back I used to see them every Sunday lunchtime in Surbiton in "The Monday Band" - they're good in their own right, but were stunning together...)
Trios, there's only one 3-git band I really like, Lynyrd Skynyrd - and I preferred the Rossington/Collins/Gaines trio (don't know a great deal about the post 76 line-ups)