When the Flamingoes were singing Alcapella they were one of the best, later their greatest hits had music background
Back then now long ago gone Record Labels were alcapella
MelloMood records
Catamount records.
Some of whom I think were among the best alcapella groups.
The Rob Roys
The Persuasions
The Excellents
Dino and the Heartspinners.
Frankie Lymon and the Teenagers
Theres tons more of course and I cant remember them
This isnt alcapella but these guys were fantastic Alcapella Group
The Persuasions...listen to this base