It’s an app or service that allows you to convert YouTube to MP3 - turn video into audio. In this guide, we review the best and safest options you can use online or on your Mac. To save a song or playlist from YouTube, you’ll need a YouTube converter. The problem is, your song is most likely.a video. Undeniably, YouTube is one of the largest content platforms out there. If there’s one place that has the song you want, that’s probably YouTube.