Some people don't know about Nico Nico Douga(ニコニコ動画), either because the site is in Japanese or they just never heard of it. From the creators of Nico Nico Douga, they bring you...Nico Sound(にこ☆さうんど＃)! Nico Nico, allows you to take a link from one of the videos (since some MP3s you can't get out in the real world.) and download it using Nico Sound. So it's quite convient.