The Beatles Releases from 1965 through 1969 were so far ahead of their time that the were revolutionary. Rubber Soul, Revolver, The White Album or Abbey Road. They certainly had a few pop songs, but so much of their music was not pop at all and the boys were capable of Rocking.They even bordered folk.
What is the VERY BEST CD album you've ever heard?
Just like with records, I came across releases on CD that were never popular, but bring lots of interesting music and so I started collecting CDs that do have collectible value for the reason of a great and rare music presented.
So far album "Sauce Hollandaise" by Ashra is on my #1 desirable list
"Best Band You've Never Heard In Your Life" by Frank Zappa is my 2nd best CD I've ever heard.