Many YMCAs use different names for the Mossa programs all including the word "Together". Group Power is Strength Train Together and Group Ride is Cycle Together. The programs are exactly the same, just different names. Y's don't have to use Mossa programs and many in my area continue to offer generic cycling.
As for how often the music changes, Mossa recommends that instructors use the same music only a certain number of weeks, different for each program. Group Ride is the shortest, 3 weeks. For the following 10 weeks until the next release comes out, instructors are supposed to go back to old releases. There are over 40 of them now, so plenty of variety.
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