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Re:Andreessen Horowitz Invests $15M In Text Annotation Start... by pirroh on Wednesday October 03, 2012 @06:56PM (#4610045)
Google built something similar years ago--not a direct competitor to RapGenius, but rather a generic annotation platform for the Web.

Guess what? It's now discontinued: http://www.google.com/sidewiki/ It's not trivial to build annotation platforms that are both compelling and easy to use. Hat tip to RapGenius!

Re:Andreessen Horowitz Invests $15M In Text Annotation Start... by streptomycin on Wednesday October 03, 2012 @09:03PM (#4610441)
It is trivial to build a lyrics site, and it would be very helpful to search users who so often search for lyrics and wind up on shitty websites.