The official site (
http://nippon1.jp/consumer/torinohoshi/ , in "collaboration" -> 2nd tab)
has 3 of the songs, for those curious about it, and there is the "Niconico rip":
http://www.nicovideo.jp/watch/sm2503435
Since the songs in this album are just image songs and not featured in the game, what value should "classification" have? "original work"?