Client_03 has been played on NTS over 20 times, featured on 26 episodes and was first played on 13 August 2019.

Client03 is an anonymous electronic music producer who focuses on electro, dubstep, and jungle. The artist is known for being intentionally mysterious, describing their persona as "neither human nor machine," and has built a following since emerging in 2019. Beyond the music, Client03 is a vocal advocate for increased public awareness regarding personal data privacy.