If you're looking to share the "magic" of finding direct music directories (often called "Google Dorks"), here are a few ways to frame it depending on your audience:
Some archivists maintain private collections for podcast backups or radio show repositories. They don't realize that setting Indexes is dangerous because it allows the entire world to spider their storage. intitle index of xxx mp3 link
intitle:index.of mp3 (Returns every open directory with audio files. Too broad.) If you're looking to share the "magic" of
: This is an operator used in search engines to search for a specific keyword within the title of a webpage. When you use intitle:index , you're telling the search engine to look for the word "index" in the title of the webpage. intitle index of xxx mp3 link