Target/codes: allocate every whole event once between A/B, preserving all rests; partial AC9AMUFD01/FC01. Prepare: share-this/own rhythm, invitation C.
- Welcome · 3 min. “Who has this sound—A or B?” Offer source roles, exact broad/raised/word/direct-adult access, one-part/pass.
- Model · 4 min. Practice ALL 1,3,4, A 1. B gets 3,4, not 1 again; both wait 2,5,6. Same total alone does not check exact coverage.
- Try together · 5 min. Adult duplicates one event and misses another; child restores ownership at the actual beats. Remove model before own creation; no social fair-turn score.
- Child choice · 7 min. Child gives each own ALL sound to one source role, neither on rests; bounded sharing uses both roles at least once, own open alternative allowed. Try one reviewed part with waits; whole shared trial only if wanted, or direct adults/silent plan.
- Notice · 4 min. Save ALL/A/B exact beat relation and own choices separately from actual maker/timing/source/audience. Equal counts cannot prove complete union, one owner or people fairness.
- Close · 2 min. Choose a part to keep/try or stop. A/B are roles, not ranked people.