Royksopp (Norwegian pronunciation: ['royksop]) are a Norwegian electronic music duo from Tromso, formed in 1998. The duo consists of Svein Berge and Torbjorn Brundtland. Royksopp is the Norwegian word for the class of mushrooms known as puffballs, the band's name substitutes o in place of o. Berge and Brundtland were introduced to each other through a mutual friend in Tromso, Norway. They enjoyed the same films and music, and shared an interest in electronics.

Royksopp's third studio album, Junior, was released on 23 March 2009, featuring the single "Happy Up Here". The song debuted on BBC Radio 1's Pete Tong show on 9 January 2009. It was officially released digitally on 16 March 2009. The music video for "Happy Up Here", made by Reuben Sutherland, features elements from the arcade game Space Invaders. Both the single and the video were met with positive reactions from the press and fans. "The Girl and the Robot", the second single from the album Junior, featuring vocals from Swedish singer Robyn, was released on 15 June 2009. The vinyl and digital versions of the single included remixes of the song by Kris Menace, Chateau Marmont and Spencer & Hill. At the 52nd Grammy Awards, the Jean Elan remix of "The Girl and the Robot" was nominated for Best Remixed Recording, Non-Classical. "This Must Be It" is the third single from the album, including vocals from Swedish singer Karin Dreijer Andersson of The Knife and Fever Ray. The single also featuring remixes by Thin White Duke, LehtMoJoe, Rex the Dog and Apparat, among others. The band later released the stems for the song "Tricky Tricky" as part of a remix competition and the winning entries were released on 27 October 2009. Junior was a success around the world. The album peaked at number one in Norway, the band's third consecutive release to do so. Junior also peaked at number 21 on the UK Albums Chart and charted on many Billboard charts, including the Billboard 200-the first Royksopp release to do so-where it peaked at number 126. The album also peaked at number four on the Top Electronic Albums chart and number two on the Top Heatseekers chart. Junior was followed by Senior, which is more quiet, "withdrawn and introspective" and "create[s] an atmosphere and an ambiance". Senior is the duo's first album to consist solely of instrumental tracks. The first single from the album, "The Drug", was released on 9 August 2010. The album itself was released on 13 September 2010, and was successful in the band's native Norway, peaking at number one, the band's fourth consecutive release to do so.Answer this question using a quote from the following article:

When was Junior released?
Junior, was released on 23 March 2009,