YouTube mp3 is closed but there are alternatives -
YouTube MP3 Downloader extension - Opera add-ons
Amazon.com: Download Youtube as mp3 [Download] : Software
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Advanced Youtube to MP3 converter extension - Opera add-ons
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YouTube to MP3 Converter
YouTube to mp3 Reddit - Safe Converters - Stack Browser
Everything You Need to Know About Converting YouTube Videos to MP3: From the Best Converters to Legal Considerations - Neon Music - Digital Music Discovery & Showcase Platform
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Youtube to MP3 - TubeBus APK for Android Download
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YouTube-mp3 officially shuts down | Complete Music Update