Google's Blob Opera combines machine learning with animated operatics (Photo / Google) Sun, 20 Dec 2020, 10:54AM With school out for the year and many taking their summer break, many families will be looking for something fun to do over the next few weeks. Google's latest machine-learning game may be one way to pass the time, thanks to Blob Opera. Four actual opera singers — Christian Joel (tenor), Frederick Tong (bass), Joanna Gamble (mezzo‑soprano), and Olivia Doutney (soprano) — recorded 16 hours of singing and their voices were used to train a machine learning model to create an algorithm for what opera sounds like mathematically.