They learned their trade playing rock and roll in Hamburg before they became a pop band and towards the end of their career there are some distinctly rocky tracks, on the White album particularly. Fitting rigid categories to bands isn’t always easy, especially if they start playing different tunes part way through their careers.
Back to the topic, I’m rather fond of Thrack (King Crimson) and Grace (Ketil Bjornstad), both CD releases. The latter is Scandinavian jazz settings of poetry by John Donne and is a warts and all recording so not for some with more audiophile sensibilities.