However, my favourite Free album is, by far, 'Fire And Water' -one of the pinacles of late-sixties/early seventies rock, IMHO-, followed by 'Tons Of Sobs' -the most pure blues-rockish album of their discography-
A more technical article by Lewis Porter, published last September:
Deep Dive with Lewis Porter: In Praise of Art Tatum, Stealth Radical in the Jazz Piano Pantheon