Youtube to mp3 very simple and awesome
there are many ways to download music from youtube
the way I am going to show you is very very very simple and if you want to download in your mobile you can do that too.
no hack or jailbreak/root needed.
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from iphone or any other mobile
open appstore / playstore etc
and download any download app
which will help you to download the song
now open download app and in url
type http://www.321youtube.com
search for song download it and you can find your downloaded song in files tab
and also you can move your songs from mobile to pc
open itunes connect mobile
go to apps scroll down
find download app icon and click on it
on the right hand side you will see all the files
no select and save it to desktop
thats all enjoy