As far as I know, Watercolor breaks no law. All the songs used in them are shown on this webpage. I don't really consider Watercolor as an art at all, basicly because, if one subtracts all the songs performed by other artists, in practice, nothing remains. It's also not about spreading songs illegally, since none of the songs can be "extracted" from a Watercolor - not even an "enjoyable" part. It's only about having fun and sharing this fun with others. So, if you're the composer or the performer of any of these songs, or, you own the rights of any of them, please, consider Watercolor as a free commercial for the particular song. Many times people bought certain songs just because they heard it in a Watercolor and they didn't know about its existence before. Have fun, listen and enjoy!