Spotlight Recursive Search in Finder
Spotlight Search
Use the kind attribute in your Spotlight search.  For example, in the search dialog, type
kind:mp3
to find all MP3 files.  I have a listing of all the relevant attributes in this answer.
So, for a more relevant example, you would issue a Spotlight search with your search term in double quotes and specify the attribute as follows:
&quot;search term&quot; kind:mp3

Not indexed by Spotlight
If you have a location not indexed by Spotlight, the most efficient tool for doing this is the built in tool find, however, since &quot;Terminal&quot; is off the table, you're options are limited.

Use Finder Search ⌘ CommandF and create a query for that specific location.  Here's an example of a Finder search for images in my &quot;Backgrounds&quot; folder (and below)


Use a 3rd party tool.  Disclaimer:  There are many tools out there, but the good ones will usually have a cost. These are the ones I'm familiar with however, they are not what I use as I prefer to utilize built in tools like find, mdfind and even locate via the command line.

HoudahSpot 5 ($35USD) Allows you to create and save complex search queries on macOS.
Alfred (Free, but Powerpack is about $40USD).  This is more of a productivity and workflow tool, but it does have excellent search capabilities.  The Powerpak can greatly enhance all of the functions.
Find Any File ($8USD).  A search utility that goes beyond Spotlight.
EasyFind ($0). File search utility that helps organize your searching.   Recommended by user Tetsujin