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I may misunderstand, but it seems that rap genius has a specific type of annotation (ie best explanation rather than comment-thread). I think the OP's suggesti

• nagrom 14y ago
  It's essentially a threaded HTML-box overlay for a certain part of text. I think that's how you would implement such a system, isn't it? Just because RG uses it for explanations doesn't mean that it can't be used for exposition/comments. In fact, I think that when RG blogged on their problems with Heroku, this is the style that they used.
  • jpwagner 14y ago
    if all you meant was text-overlay, then yes. in fact, lot's of sites do this.