Sphero's Specdrums rings bring beatmaking to your fingertips
Amazon.com: Sphero Specdrums (1 Ring) App-Enabled Musical Ring with Play Pad Included - Create Sounds, Loops, Beats for Musicians of Any Skill Level - STEAM Educational Music Toy for Kids, White :
Amazon.com: Sphero Specdrums (2 Rings) App-Enabled Musical Rings with Play Pad Included - White (SD01WRW2), Package may vary : Toys & Games
the 3D printed 'specdrums' ring lets you play music by tapping colors
Sphero Specdrums let me turn CES carpets into sweet music - CNET