Are we supposed to comment on the coding or the business model? Not bad for four weeks coding. Might have a little trouble making money with the copyright issues involved.
feel free to give your thoughts regardless
On the copyright side, there have been issues in the past (http://news.cnet.com/Lyrics-site-negotiates-copyright-issues...). I'm not sure how they were worked out, or if a defense of "everyone else is doing it" justifies reliance. You should look into any updates in the area, and also be aware that one day someone might disagree with you on if its ok (and by disagree I mean sue).