Leprous is a Norwegian progressive metal band formed in 2001 in Notodden, Norway. The band gained prominence as the backing band for former Emperor frontman Ihsahn's live shows. Ihsahn has, in turn, contributed to several Leprous albums as a vocalist (on "Thorn" from Bilateral and "Contaminate Me" from Coal) and as a co-producer for Coal.
After releasing several demos with relatively unstable lineups, the band's roster solidified by the time that they recorded their debut album, Tall Poppy Syndrome in August 2008. American label Sensory Records signed the band and released the album in May 2009. Alex Henderson of Allmusic praised the band's debut for moving past the "staunchly pre-90s mentality" of contemporary progressive metal by blending the influence of Pink Floyd and King Crimson with alternative metal bands such as Tool.
The album received positive reviews while the band gained attention as the live band for Emperor's former frontman, Ihsahn, whose wife is the sister to Leprous vocalist/keyboardist Einar Solberg. In 2010, Leprous appeared at ProgPower USA and ProgPower Europe, and later supported Therion on their European tour. After that tour, the band announced that they had split with bassist Halvor Strand, who was replaced by Rein Blomquist.
At the end of February 2011 the band announced that they had signed with InsideOut, with worldwide distribution through Century Media. The band's debut for InsideOut Records, Bilateral, was released on 24 August 2011 and featured artwork by American surrealist Jeff Jordan and the Spanish designer Ritxi Ostariz. The album featured a guest vocal appearance by Ihsahn and trumpets by Vegard Sandbukt.
On 20 May 2013, Leprous released Coal. Vocalist Einar Solberg described the album as "a more melancholic and darker album than the more playful Bilateral. By darker, I don't mean more aggressive, but more severe. There is still a big range in the dynamics, but no jumping between different moods within a song."
On 5 May 2014, the band announced the departure of drummer Tobias Ørnes Andersen. He was replaced by Baard Kolstad, who played with Leprous throughout their 2013 Coal tour. The statement also revealed that the band are currently working on material for their next album.
In early June 2014 Prog magazine Radio Show on Team Rock Radio in the United Kingdom published tour dates for an Inside Out records Showcase featuring that label's Haken, Maschine and Leprous for Autumn 2014 in the United Kingdom and Europe.
On 25 May 2015, they released their latest album The Congregation, via Inside Out Music. A video for the track "The Price" was shot and then released on 8 April. On 30 April 2015, another track of the album, "Rewind", was released.