Having learned recently that most artists of the 1960's specifically recorded in mono has lead me to reconsider a medium of recorded music that I've always considered as inferior. Turns out The Beatles, Brian Wilson, Bob Dylan and Phil Spector preferred the medium (Wilson was deaf in one ear; he heard everything in mono). For someone trained in stereo separation since their inception like all of us, it can be jarring at first, especially with headphones. All of the sound is rushed to the center of your cranium, causing that Wall that Spector created, especially on later, more advanced recordings of the decade.