I'll bet those CDRs are impressive.Some time ago I found an MP3 on the web of studio outtakes from the Byrds' Tambourine Man sessions. Absolutely sublime...magical!
IIRC, my mastering friend mentioned the Wrecking Crew only played on the first single (Mr Tamborine Man and “B” side) but the band played on the rest of the album tracks recorded after the single was released.
There’s a documentary on the Wrecking Crew - no doubt on YouTube. Only the best of the best musicians were allowed to join.
An aside, my mastering friend (Steve) had a standing breakfast reservation once a week with Hal Blaine and other “behind the scenes” people - the stories that were told!
Quick story...
Steve and his label president had reached a deal with Ray Charles to remaster a few of his top albums. They headed to Ray’s house with a check printed in braille, as requested by Ray. They knocked, Ray answered and was handed the check which he “read” with his fingers.
After a few moments, Ray smiled a huge smile and said, “Boys, we got a deal!”