Best YouTube Settings to Reduce Data Usage

 https://www.influencersgonewildco.uk/how-to-save-mobile-data-while-using-youtube-complete-guide/

Looking for a simple way to convert YouTube videos to MP3 without ads or extra steps

 https://community.shopify.com/t/looking-for-a-simple-way-to-convert-youtube-videos-to-mp3-without-ads-or-extra-steps/581203

YouTube to MP3 High Quality Audio

 http://www.khanacademy.org/teacher/document/061a157b4606c3789c3e34bd70f7b631372f5b66/view