Opus X is one of the leading Finnish early music ensembles and has made concert appearances and recordings of groundbreaking importance in the Finnish early music scene. Opus X was founded in 1995 at the initiative of violinist Petri Tapio Mattson; Mattson became the ensemble's artistic director. Initially the repertoire consisted entirely of chamber music, which the ensemble has performed in wide variety from Italian Early Baroque to quartets of Haydn and Mozart.
Opus X is an ensemble whose main priorities are quality (rather than quantity) and projects of national and international interest. The goal is that the ensemble's concerts and recordings offer something special, whether it is repertoire seldom or never heard before, or a fresh take on a mainstream classic. A key part of realizing this is the employment of the very best forces within the Finnish early music performance and co-operating with top-class guest soloists.