The most musically ambitious album in the history of Pop music.....

.....that unfortunately was aborted before it could be brought to life (at least in 1967, and was intended).

The film linked below (Beautiful Dreamer: Brian Wilson And The Story Of Smile) was made by David Leaf in 2003-4. A new book by David covering the same topic has just been released: The Rise, Fall, And Resurrection Of Brian Wilson. Perfect timing!

I know it’s "only" The Beach Boys, but I predict you will find what George Martin ("Why does this guy have so much talent? It’s not fair."), Bob Dylan, Elvis Costello ("There’s a continuum that goes George Gershwin, Cole Porter, Richard Rodgers, Burt Bacharach, Brian Wilson"), Jimmy Webb, Burt Bacharach, Lou Adler, Dennis Wilson ("Smile is so good it makes Pet Sounds stink"), Van Dyke Parks, Carole Kaye, and many others have to say about Brian, Pet Sounds, and Smile of considerable interest. 

https://youtu.be/_Nb7T0lrEAQ?si=FZF2hIq7u8ELaNmr