Singers.com - List of Vintage Harmony Groups

https://www.singers.com/group/vintage-harmony/

on a whole new meaning. Performing groups of that age were some of the first to have the mass commercial appeal the current generation is so accustomed to their stars having. And

Art and Culture in the 20th and 21st Century

https://www.scaruffi.com/art/20th.html

and "Punk" bands begin performing in New York 1974 : Alvin Curran composes "Canti E Vedute Del Giardino Magnetico", a collage for for voice, instruments, electronics and natural s

That's everything I could find.
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