There are at least two bands with the name 'Opus 5': 1) Opus 5 were a progressive jazz/rock fusion band from Quebec, Canada, active in the 1970s. 2) Opus 5 is a jazz quintet featuring Seamus Blake, Alex Sipiagin, David Kikoski, Boris Koslov and Donald Edwards. They have so far release three albums, all on the Criss Cross Jazz label: 2011 - Introducing Opus 5 2012 - Pentasonic 2014 - Progression