Harsh, yes, but I had the same experience. I scrolled around looking for some actual music, then left the site to check HN news comments.

Thanks for the tip about the "popular" link, I had missed it. After checking out a couple scores I signed up, looks like a cool site. Had the site simply put their top 4-8 songs (with that nifty preview-on-hover) on their landing page, I imagine their sign-up rate would skyrocket.