Do you like classic rock and legendary albums, and 70’s quad done really well?
Then I suggest you grab first Jeff Beck “Wired” all three Santana titles especially III, and Miles Davis “Bitches Brew” for starters.
Those are exclusive quad mixes to the Japanese 7” series of SACDs. “Some” of the other titles offered are found on other issued discs in quad and 5.1.
Sony is imo issuing the best quad titles right now for quality and choice titles. Best packaging in the industry too. And the most expensive discs as well.
They are slow to release each one but that’s fine, it makes them easier to budget for.
The next Santana disc is going to be quadraphonic reissue of the year. Stay tuned.