Extince (also known as Exter-O-naldus or De Exter) is one of the first Dutch language rappers in the Netherlands to appear in the Dutch music charts.

Extince was born as Peter Kops in Oosterhout, Netherlands. One of his biggest musical influences as a child was Creedence Clearwater Revival.

His first successful song, The Milkshake Rap, was written completely in the English language and was produced by Peter Slaghuis. His first song in Dutch, Spraakwater, was an immediate hit upon its release in 1995. It contains samples from the famous Dutch children’s television series De Fabeltjeskrant. Another important Dutch hip-hop group, Osdorp Posse, recorded a parody of Spraakwater called Braakwater.

Extince’s second hit was Kaal of Kammen, released in 1996 as a response to Braakwater. His first album, Binnenlandse Funk, came out in 1998. It was in the Dutch Top 40 for two months, and reached number 12 at its peak. One of the most popular songs on this album was Viervoeters.

Extince released a second album, Vitamine E, in 2001. Its most popular song was released Grootheidswaan. In January 2004, he released a third album, 2e jeugd, followed by De avonturen van de Exter-O-naldus in 2005.

In 2007 he released the album Toch?.