There are at least three artists/bands named Duality. 1 - Progressive/uplifting trance-project was founded in 2007 by two producers from cold russian Siberia - Matthew Preffekt and Alex August. 2 - A Progressive Death metal band from Tampere, Finland. 3 - A trans-Atlantic Scots/Texan guy/girl duo; based on the internet. They also go by Duality237 (2)Early history: Duality was born from the ashes of a Metallica/Megadeth cover band, originally implemented by Matti Auerkallio (guitar) and Tero Heinonen (drums) in Valkeakoski, Finland.