Well, I think you're in for a treat when you open Sgt. Pepper's. I was only familiar with the Capitol stereo version for many years. Then a few years ago I read Geoff Emerick's book (Here, There, and Everywhere) about his experiences in the control booth with The Beatles. He mentioned how they spent most of a work week doing the mono mixdown of Sgt. Pepper's, and the Beatles were present for that. The stereo mix was a toss-off, done in a few hours and with no Beatle involvement. The stereo version had always sounded thin and brittle to me.
Not so the mono version. It's warm and rich. There are even some content differences. For example, you'll hear a significant difference in the laugh track at the end of "Within You Without You."
Not so the mono version. It's warm and rich. There are even some content differences. For example, you'll hear a significant difference in the laugh track at the end of "Within You Without You."