Born Ariane Daniele Forster in Munich, Germany, she rose to prominence in the late 1970s as the charismatic frontwoman of the London-based band The Slits. Her unconventional vocal style and energetic stage presence became central to the group's identity during the emergence of the UK punk scene.

The Slits were noted for their fusion of punk rock with reggae and dub influences, a sound that distinguished them from their contemporaries. Ari Up remained a recognizable figure in music for her distinctive fashion and vocal delivery, which challenged traditional norms of female performance in the punk genre.

Following her time with The Slits, she continued to pursue various musical projects and collaborations throughout her career. Her legacy remains tied to the pioneering role she played in the development of post-punk and the experimental integration of Caribbean musical styles into the British alternative scene.