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) :
How to Convert MPEG to MP3 on iPhone or Android
video ko mp3 me convert kaise kare online - YouTube
JackNg C. H. Blog: Convert .ivr files to .wma or .mp3 format using RealPlayer and a USB thumbdrive (Rev: 1.3)
Top 10 Sites to Convert YouTube to MP3
Convert MP4 Video to MP3 Audio - YouTube
Video MP3 Converter - Apps on Google Play
Convert Videos To Mp3 download app free:Amazon.ca:Appstore for Android