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It appears that the 'beta' status of Music Fans is the chief obstacle to migration from Music Practice & Theory. What needs to happen before graduation?
Based on the answer to this related question, the scoreboard on Area51 gives a breakdown of the areas of improvement.
Everything is Okay or Excellent except for Number of Questions per day. Need to get up to 5 to get out of 'Unhealthy'. Currently 1.1 q/day.