https://www.cnbc.com/2018/05/08/google-assistant-adds-john-legend-as-one-of-six-new-voices.html

Google will unroll six new voices for its Google Assistant, including that of entertainer John Legend.

The voices will be both male and female, and will be made more natural with a technology called Wavenet, which Google's DeepMind artificial intelligence team announced 18 months ago.