Thank to @jdmack for the link into the Billboard archives.
When one does a search for Quadraphonic, and limit the scope to 60s, 70s and 80s, you get a deep trove of information. You can also search for more specific items.
https://worldradiohistory.com/hd2/I...=5&zoom_cat[]=6&zoom_cat[]=7&zoom_per_page=50
EDIT: Here’s a link to all the BB magazines by Year and Date:
https://worldradiohistory.com/Archive-All-Music/Billboard-Magazine.htm
When one does a search for Quadraphonic, and limit the scope to 60s, 70s and 80s, you get a deep trove of information. You can also search for more specific items.
https://worldradiohistory.com/hd2/I...=5&zoom_cat[]=6&zoom_cat[]=7&zoom_per_page=50
EDIT: Here’s a link to all the BB magazines by Year and Date:
https://worldradiohistory.com/Archive-All-Music/Billboard-Magazine.htm