if you have download access to binary groups, this collection of
Atlantic R&B vocal group recordings has just been posted
(I have both albums digitized as mp3s in a folder dated 2011):

https://www.discogs.com/release/11422925-Various-Dont-It-Sound-Good-The-Great-Atlantic-Vocal-Groups
https://www.discogs.com/release/13509836-Various-All-Night-Boogie-The-Great-Atlantic-Vocal-Groups-Vol-Two

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