I've just played it for a little, since I liked the idea. I think it's a good way of promotion, it's a nice concept! I'm not an EP collector (I mean, jewel case, physical media and stuff), but I have one of Mozart. Why am I mentioning this? You see, aside from the music, which I love, it has information about him. I like this kinds of stuff. And I feel that this is not just a nice little experiment on that, but also a neat way to turn that little extra some physical discs have, but this time as digital media.
I've just got the first song, and I must say, I love it. However I must also mention that when you use the item, the music starts (which is cool), but the music in-game keeps playing too. I wonder if you could mute the music after using the item, and wait, IDK, for a key to be pressed (I guess that making the game know if the song is playing in the browser must be close to impossible, at least I'd have no idea on how to do it haha!).
Now for the game itself, I think is pretty solid as far as I've seen, which is very little. I just jumped back to the forum post to write this before I forgot xD. I loved the intro. Really nice art!
Godspeed!