OK Hunnie, I went to that link, but then what? Do I just need to copy and past the link from youtube to download the music? I am kind lost, not too bright with tech. Sorry.
Be warned that almost all downloading music applications are going to come in as an expense. To name a few - Bearshare, Limewire, and back in the day, Napster - all come at a price. Don't be surprised when you get some shit on your browser with something saying that you've committed something illegal...and it prevents you from doing anything else on your computer until you pay a fee. It's quite deceptive because it looks professional. It's not. I personally think the best way to get your music is to go through torrent sites, particularly private groups, or just go to your friend's house and steal his music while he is taking a dump. If you're talking about Youtube music, then just go to any of the available sites to convert whatever's on Youtube into mp3. There's plenty. The quality isn't good but whatever floats your boat.
I still use Frostwire (very similar to limewire), bit torrent and sometimes mediafire links for the MP3 downloads.
As far as I remember, with j downloaded, you just need to copy the link of a YouTube video and it will show you all type of content that you can download. You can then get the video in various quality and the mp3 as well