You may not be able to grab the audio out of the PowerPoint file, but I can show you one way to try.
As for identifying the music, there’s an app for that.
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Retrieving inserted files
First, let’s talk about the PowerPoint presentation. If you’re able to open the presentation in PowerPoint so you can edit the presentation, then you should be able to locate the inserted audio file and save it to disk separately. That’s perfect because you get the audio file with its original fidelity.
Now, PowerPoint does support a format that is not editable. In other words, it opens simply a read-only version of the presentation file. I’m not certain if there’s a way to extract any of the components if the presentation is not editable.
Every other approach that I can think of involves playing the audio file and recording it at the same time through some various machinations. It’s not easy and I don’t think you end up with as good fidelity.
Identifying the artist
But you may not need to do this if you have access to a smartphone and can download an app called Shazam.
Shazam is pretty amazing technology. What you do is you start playing the music on your PC and then open the app and press the Touch to Shazam button. The app listens to the music for 10-20 seconds, matches it to a database that it has, and displays the title of the song and the artist who recorded it.
I’ve done this in crowded restaurants with background noise and it actually does a pretty amazing job of identifying the music that was playing over the PA system at the time.
Now, Shazam doesn’t know everything. You can’t sing into Shazam to identify a song. A song has to be commercially released; if the song in this presentation is something a marketing department created in-house or looped from a company that creates background music, Shazam might not be able to find it.
But if there’s a commercial recording out there of the music or the sound that you have, then the first thing that I would do is hold up Shazam and see what it does. If the song is out there, you may have a chance to purchase and download the original.