algorithm ambient app apps board cards circle-of-fifths classic competitive composers concentration conducting cooperative cooptional cue-cards dance dice drawing easy events few-players free-improv game guessing hard high-intermediate highscore images in-genre insert inspire-cards instrument-preparation instruments interpretation jigsaw keyboard kids listening loop low-intermediate many-players matching memory minimal narrative no-props pairs piano puzzle quick random rhythm role-play score simple solo somido sound-collage sound-design spatial speeding-up teams timed tonal voting words