I love the first three Procol Harum albums (pianist Matthew Fisher left after the third, Robin Trowers’ guitar playing turning PH into just another blues-based riff band. So sad.). Those first three PH albums WERE (and still are) filled with great music. But PH’s Shine On Brightly (one of) the first real progressive album(s)? Why not their first album? Are you including Brian Wilson’s Smile? Or Frank Zappa’s Where Only In It For The Money? Or the first Pink Floyd? Or Van Dyke Parks’ Song Cycle? Or the many other obscure albums I have no doubt you are unaware of.
That you would state Electric Ladyland is the best album recorded in the 60’s says all that needs to be said. So sad ;-)
A musician’s opinion of Bogert and Appice is a very effective "filter" when looking through applications for band members. Oh, they are SO bad. They never heard, contemplated, and took to heart what Duke Ellington, a very tasteful musician, said about musicianship: "What you don't play is more important than what you do". Wisdom from an old, though not 100 year old, man.