An AI-based game on the Google Arts & Culture website that lets people drag four "blobs" up, down, forward and backward to cause them to change shape and sing opera. People find the animation and singing very entertaining. See
Google Arts & Culture.
The Four Blobs
Each blob is a different vocal range; from left to right: tenor, bass, soprano, mezzo-soprano. Dragging any one causes it to start singing, and the other three chime in and harmonize. Moving the blob in different directions causes their bodies to undulate, and the highest voice leads the harmony. (Images courtesy of Google Arts & Culture.)