What is considered a "passing score" on each segment?

Each lesson in Playground Sessions is made up of short lessons called "segments". These segments, by default, are colored grey to indicate that they have not been completed yet.

Once a user achieves a "passing score" of at least 80% accuracy in a segment, the music icon for that segment will then turn green and be marked as complete. The highest score achieved in the segment will also be listed to the right of the segment's name.