Talks about legal
file-sharing. Spends most of the (brief) article on Spotify which pays for the rights to distribute music. I don't think this helps you too much.
Can't comment too much on this. The article is too brief and the study is all in Japanese so I can't judge too much. However, the abstract reveals that some money is lost in the rental business and is neutral on sales (Winny) while YouTube gains money in the rental business and boosts purchases.
I question whether you read these or just thought their titles were pretty.