Callisto is a post-metal band from Turku, Finland. The band was formed in 2001 in Kokkola. Whilst their early works are hardcore/metalcore, their first album True Nature Unfolds has a strong sludge metal and doom influence and their second album Noir is more influenced by progressive and more dynamic sound. Their third album Providence was released in 2009, introducing wide use of clean vocals in their music. Apart from featuring female vocals on some of their early songs, they have used unexpected instruments, for example saxophone, cello, flute and English horn. Callisto's short and cryptic lyrics contain Christian themes and references.
Callisto has headlined several tours in Europe from 2004 to 2009. They also opened for High on Fire on their 2005 United Kingdom tour. In March 2007 Callisto showcased in Canada and USA, playing at the Canadian Music Week in Toronto and South by Southwest festival in Austin, Texas, to name a few.