I know it's off topic but I feel like an idiot now. I posted a link to this a while back: http://micropledge.com/projects/music-mash without knowing that this had already been done by a YC startup. On one hand, I'm really glad to see that someone has done this idea. On the other, I'm upset that it wasn't me.

At the risk of sounding desperate, I often wonder if I will ever get it right!