How to Download YouTube videos as mp3 with Addoncrop
Convert Video to MP3 with The Ultimate Way and Top 10 Online Ways
Save YouTube Video MP3: How to Save Any YouTube Video as MP3
GitHub - gibcheesepuffs/Save-as-MP3: Save as MP3 is a little application for android which can help you download YouTube video as MP3 easily by sharing the video link from YouTube application or browser.