This article explains how to insert audio into Google Slides from a streaming service, a YouTube video, or an audio file that you've converted to MP4 format.
If you've found an audio file on the web that you want to use in your presentation, add a link to the file on the slide where you want the audio to play. You can find links to audio files on music streaming services like YouTube Music, SoundCloud, Spotify, and Apple Music.
When playing audio from a music streaming service, you must start and stop the audio during your presentation. In addition, the computer you use must be connected to the Internet.
Open SoundCloud in a browser window and go to the page containing the soundtrack you want to use.