, who wrote the book Recording The Beatles: The Studio Equipment and Techniques Used to Create Their Classic Albums
, tells us that "Blue Jay Way" is the most impressive Beatles song in terms of engineering. Says Brian: "It has phasing, flanging, it has varied speed recording, it has tape echo. They put things through Leslies, they compressed and EQed things. It's really fascinating, and it has more stuff going on with it that's more detached from traditional classical recording or a Miles Davis record. It's more Beatles-y in that way. All the tricks that The Beatles had developed with compressing instruments and with EQing things in very strange ways are present on "Blue Jay Way."
My favorite part of it, which is really a fascinating concept, they took the track, specifically with the vocals, and then mixed it. That mix was played backwards and recorded back into the record on the multi-track, but they played it through a Leslie speaker that's spinning in the room. So occasionally during the song you hear some backwards Leslied tracks, especially vocals, swirling in and out. It's the actual song playing backwards against itself through a Leslie and then fading up and down, which is a really creative and very strange idea. I've never heard of anyone else doing something like that."