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Had never occurred to me that ABBA carried on the vocal traditions of The Mamas & The Papas, but you're right - there are a lot of similarities there.
I'd argue that Fleetwood Mac were The Mamas & The Papas of the 1970's though, right down to practically everyone in the band sleeping with each other. It's just that with Mac, the gal with the big voice was also the band's sex symbol.