All Vocaloid songs are essentially fan-made (though some people do sell albums) and the website Piapro.jp is made specifically for artists to make those songs available for free for anyone who wants to use them. The only conditions on the pages are that the songs may not be modified, and that if you use the song in making a video of other project, you must give credit to the artist. So I don't believe I'm breaking any rules by posting these songs here.
