[WalterBright]

The interesting thing about McCartney & Lennon is they competed with each other and critiqued each other, and that resulted in their greatest songs. After they went their own ways, there songs weren't as good. I suspect there was nobody else who dared to criticize their work.

[throwaway422432]

Interesting idea. Thom Yorke and Jonny Greenwood seem to have a similar dynamic.

Both have their own thing going on the side, including The Smile together which is great. But Radiohead where they had Ed, Phil and Colin critiquing and improving their output is a different level of polish.