REVOLVER...

Music of The Beatles changed my life. Sure other artists influenced me too, but it's said The Beatles were inspired from many of the American musical artists.
Elvis, Chuck Berry, Little Richard, Bob Dylan to name a few.
Oddly, I never really followed the music of the musicians who influenced The Beatles. What a concept!
Early Beatles trivia I learned was from the album covers and 'teen' magazines that were filled with stupid things unrelated to their music. Like, Ringo's birthday or John's favorite color and had little or nothing to do with the music.

Usually on the weekends, I immerse myself in YouTube videos. Sometimes they are instructional, or science related... but there is always room for music and a few documentaries about musicians.
It seems the more I research things about The Beatles, the more I realize what little I really knew along the way.
55+ years later I found out that Abby Road Studios was really EMI studios. I knew that the recording equipment in America was far superior to what was in use in England at the time and I'm not sure why they didn't import those tape recording machines.

EMI studio was setup to have full musical scores used in movie soundtracks. One large room where a symphony of 40 musicians, lots of microphones and a control panel would record as though the listener were present in a live performance. Sound was recorded to 4-track machines. That means while recording, 4 discreet channels could be filled. Let's say drums, bass and rhythm guitar could be on the first track, piano and lead guitar on the second track, main vocal on the third track and backing vocals on the fourth track. That's it. If something wasn't right, either a mistake or a wrong recording level, the entire track had to be done again... including all the instruments or voices on that track. That would take days to perfect one song.
What happened then is, after each take was right, the recording engineer would 'mix down' the good parts to another 4-track machine so they have room for more parts. Maybe sound effects or orchestra arrangements added to the original recording. Often I would read about the original tapes used to create other versions of a song that would be decided later which version would make it to a record. Remastered is a word to describe when they make a new version (mix) using the original tapes.
I know all of this 'technology' existed, I didn't know exactly how it was applied to each song of every album. It originally came as a surprise, but it's been documented and there are lots of recording engineers who have all that information.

Many recording studios in the United States used 8-track recording machines giving a track for each voice or instrument. An example, if the piano track had a mistake, they only had to rerecord that one part and not an entire section where drums, guitar and piano shared a single track.

Paul McCartney made famous a bass guitar manufactured by the German company Höfner. It had a unique hollow body violin appearance, 30" long scale and he was seen in all live performances with that bass guitar. He also used a British VOX amplifier by Jennings Musical Instruments.

The song 'Come Together' was recorded in 1969 and to my ear, the bass guitar didn't sound like a Höfner. I later learned McCartney had switched to an American made Rickenbacker with a solid body, 34" long scale and an American made Fender bass amplifier. Much of his later recordings and performances with Wings had his Rickenbacker bass with Mesa-Boogie amplification.

The Beatles music changed with a few short years. It evolved from the live band sound to a more complex studio band, probably due to many factors... that included their experiments with psychedelic drugs, study of Eastern philosophy and the use of recording machines that could vary speed/pitch, double track for added voices, playback in reverse.

That brings me to the 1966 album REVOLVER...