How do YouTube-to-MP3 sites work? How would one go about building such a site? What libraries/technologies are used? - Quora
PHP YouTube Downloader Script 2017 that Works - How to Download a Video of Any Website using a Converter from YouTube to MP4 or Convert to MP3 - PHP Classes
How to create a YouTube video downloader using PHP? - Blog Desire
GitHub - chilledguru/yt-2-mp3-converter: run your own YouTube-to-MP3 converter php script.
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