Dear Wilton,
Thank you very much for the proper details and the video description, it helps me a lot.
The only way to achieve this is by using a custom code, as there is no such feature on the back-end. The advanced title/content fields are for different purposes. Since you have added log-in details, I have constructed this custom code, and added to the public_html/dev/wp-content/themes/rap-history/functions.php file on your dev server. Now it removes the wikipedia and discogs strings from the content.
You can add more words/strings to be excluded, just change the $replace variable (line 22) accordingly. (comma separated list of strings)
For future reference, I am putting the custom code below: