Ariane Daniele Forster (17 January 1962 – 20 October 2010), known by her stage name Ari Up, was a German vocalist best known as a member of the English punk rock band the Slits.

[3] Ari's maternal grandfather was the German newspaper proprietor Franz Karl Maier, owner of Der Tagesspiegel.

The constant presence of punk music led to Ari experimenting with it herself, learning to play the guitar from the Clash's Joe Strummer.

After the Slits disbanded in 1981, Up moved with her boyfriend, Glenmore "Junior" Williams, and twin sons to jungle regions of Indonesia and Belize and lived among indigenous people.

She appeared on Lee "Scratch" Perry's Repentance (2008),[13] and performed a duet on a cover version of Mike Hugg's song "Mister, You're a Better Man Than I" on Mark Stewart's Edit (2008).

"[14] Despite the diagnosis, she performed in July 2009, with Perry and Austrian dub band Dubblestandart in Brooklyn, New York, just before the Central Park SummerStage festival.

The sessions were recorded by the Subatomic Sound System and released in August 2010 on 7-inch vinyl, titled "Hello, Hell is Very Low" b/w "Bed Athletes."

The Slits' final work, the video for the song "Lazy Slam" from Trapped Animal, was released posthumously in accordance with Ari's wishes.

[14] A tribute Punky Reggae Birthday Party was held at the Music Hall of Williamsburg in Brooklyn by Dunia Best, Aram Sinnreich, and Vivien Goldman on 16 January 2011.