The sites that I used

https://media.goboard.io/aaron-copland-9256998

https://media.goboard.io/Copland_concierto.html

https://media.goboard.io/475

http://www.songofamerica.net/cgi-bin/iowa/composer/21.html

memory.loc.gov:8081/ammem/collections/copland/acbirth4.html

https://media.goboard.io/timeline