This ad on a YTMP3 converter makes it seem as if it's the button you are supposed to click to convert (sorry for bad quality. I'm working on a school project) :
YTMP3: Best YouTube to Mp3 Song Converter - Space Coast Daily
The Ultimate Guide to YTMP3: How to Convert YouTube Videos to MP3 Easily - TechBullion
Why use YTMP3 for converting YouTube to MP3?
Link YTMP3 Converter: Download Lagu (Mp3) dari YouTube Gratis, tak Ribet Tanpa Aplikasi | boyanesia
YTMP3-Converter (Super Fast) APK pour Android Télécharger
Ytmp3 - The Best YouTube To MP3 Converter In The US