It's actually an AB test—we know the annotations opening under the lyrics is disliked by some users, so we're working on an alternative 2-column design, which is currently in A/B testing.
The world is going crazy
Testing is how you learn and quantify how much something is disliked, or used, or leads to conversions. This is the perfect fit.
I prefer the 1-column layout (user since it was rapgenius.com). If they got angry emails from their users about their UX, and they decided to set up a test to improve it, that's not in the spirit of degrading the UX.