There are at least three bands with this name:
1) A pop/folk/psych outfit from 1970.
2) Born out of the Montreal-based avant-rock group Wondeur Brass, Justine pushed further the ideals of challenging, thought-provoking feminist rock established in its previous incarnation for another ten years. The group released three albums during the 1990s and toured Canada, the United States, and visited Europe twice. Three of its musicians are members of the collective Ambiances Magnétiques, so the label released all their albums.
Wondeur Brass started as a sextet in the early ‘80s. By 1987 the group had been scaled down to a quartet. Bassist Marie Trudeau had joined the three original members, saxophonist Joane Hétu, keyboardist Diane Labrosse, and drummer Danielle P. Roger. That lineup released Simoneda, Reine des Esclaves in 1987. Upon starting work on a new opus in 1989, the girls decided it was time for a change. The new music taking shape was turning out to be more complex, intricate, and driven by a stronger will to improvise and make things interestingly dangerous. Thus Justine was born. The first album under the new name, (Suite), came out in 1990. It included guest appearances by Japanese singer Tenko and American harpist Zeena Parkins. In 1992, Hétu, Labrosse, and Roger brought them back for a quintet project, La Légende de la Pluie. Although it doesn't include Trudeau and sounds softer and more introspective, it can be considered as the second album by Justine. Around the same time the "real" quartet appeared on-stage in an Ambiances Magnétiques showcase which yielded the live CD Une Théorie des Ensembles: Ambiances Magnétiques en Concert.
In early 1994 Justine toured Europe, visiting many former communist countries. Back in Montreal in June they recorded Langages Fantastiques "live in the studio" -- the recording of (Suite) had stretched over ten months. After its release later that year things slowed down as group members focused on individual projects: Roger on the children's tale L'Oreille Enflée, Labrosse on a solo album (Face Cachée des Choses) and a duo with Michel F. Côté, and Hétu on a new group called Castor et Compagnie. Justine stayed together for another three years and performed at the 1997 Ring Ring festival in Belgrade (Yugoslavia) alongside Ground Zero, Palinckx, and Kampec Dolores (a previously unreleased song was included on the commemorative compilation Ring Ring 1997). After that tour the group disbanded. Hétu, Labrosse, and Roger have continued to contribute to one another's projects.
3) A Chilean band formed in 1995 by Juan Carlos Oyarzun ( Vocals and guitars), and Cynthia Marinkovic (vocals). Their genre is best classified as post rock with ambience influences. Their sound has a very dark overall atmosphere, and their lyrical themes tend to look a the darker aspects of urban living. The band did some touring around Chile, while working on their first album. Before the release of the album the band broke up. In 2007 the band posthumously released their first album for free on their myspace.
as of 2012 justine has announced they are back together and releasing a new album end of the year