Nicolás Pablo Rivera Muñoz, whose parents are of Chilean origin, grew up in Bergen. He attended secondary school at Kongshaug Musikkgymnas, a music boarding school in nearby Os. He began the "Boy Pablo" project in December 2015, and first received attention in Norway in 2016, receiving a Bergenfest scholarship.

Muñoz's breakout moment proved to be the widespread attention in 2017 towards the song and music video for "Everytime", originally uploaded to YouTube in May 2017. Within a few weeks, the video had received millions of views, with Muñoz significantly expanding his fanbase.

Boy Pablo released the 6-song EP, Roy Pablo, in May 2017, which includes "Everytime". He released the single "Losing You" in March 2018. He played his first shows outside of Norway, a tour of Europe, in March and April 2018. Though he records and produces all his music mostly on his own, his live band includes his childhood friend, Gabriel on lead guitar, and former school classmates: Henrik on bass, Eric on keyboards, and Sigmund on drums.

He and the band toured the United States and Canada in July 2018.

On October 5, 2018, he released his 2nd EP, Soy Pablo