I've heard/DL'd a few of these, mostly the Beatles covers, from the main album, not the Uncovered/Unplugged sessions. I'll have to dig deeper there.
The Beach Boys harmonized as well as any musicians ever, but a lot of their (non best of/greatest hits) sounds the same, kinda like the Grateful Dead, imho.
I did a deep dive into their studio albums & got through the late &
Forum:
Tell Me