Bassey began his professional music career when he was featured on a song,
My Dream with
VJ Adams and rapper
M.I in 2015. In 2016, he auditioned for the first season of
The Voice Nigeria, and made it to the live shows, where he finished as a top 8 finalist and was subsequently signed by
Universal Music Group. In 2017, he was cast in the role of
Dr Emeka Kalu on Africa Magic's telenovela,
Battleground where his on-screen chemistry with actress
Ini Dima-Okojie enjoyed positive reviews from critics. In April 2017, he opened for
Aṣa at her concert in Lagos. In the same year, Bassey starred in the movie Wurukum Roundabout alongside several notable African actors, including
Juliet Ibrahim,
Gbenro Ajibade,
Susan Peters and Keppy Young. In February 2018, Nonso Bassey released his official debut single
411, produced by
Johny Drille. The song was well received and Native Magazine's reviewer, Edwin Okolo summarized his review of the single saying,
"Only a handful of Nigerian musicians have created ballads so powerful that they were able to steal us away from the hypnotic thump of our incessant Afrobeat march, and with “411", Nonso Bassey seems poised to join those elite ranks." In April 2019, Bassey released his sophomore single under Universal Music Group Nigeria, a soulful track
For You produced by Yekini 'Tiwezi' Temitayo with the video directed by Adesua Okosun. In October 2019, Bassey was nominated for the award for
Best Vocal Performance (Male) for his debut single,
411 at the 13th edition of the
Headies Award. He was nominated alongside Johnny Drille,
Wurld, Funbi and Tay Iwar. He changed his name from Nonso Bassey to Nonzo, following the release of his first single in 3 years "Toyo" on 12 August 2022. ==Awards and nominations==