Ossi Tanner, even called the Poet of the Piano, is the Winner of the two major national competitions in Finland: Tampere Piano Competition 2017 and Leevi Madetoja Piano Competition 2015. During the last few years, he has more and more been performing as a soloist with the leading Finnish orchestras. He has performed with e.g. the Finnish Radio Symphony Orchestra, The Helsinki Philharmonic Orchestra, Tampere Philharmonic Orchestra, Oulu Symphony Orchestra, Tapiola Sinfonietta, Jyväskylä Sinfonia, Lohja City Orchestra, Lahti Symphony Orchestra and the Ostrobothnian Chamber Orchestra.
Lahti Symphony Orchestra noted his talent quite early and invited him as its residence artist during the season 2017/2018.
Ossi Tanner has performed at almost all the leading festivals of classical music in Finland and in over ten European countries, both as a soloist and as a chamber musician. He has shared the stage with many important musicians, for example, the Brentano Quartet, Kerem Hasan, Hannu Lintu, Klaus Mäkelä, Sakari Oramo, Eiji Oue, and Joshua Weilerstein. He has studied at the Sibelius Academy with professors Matti Raekallio and Erik T. Tawaststjerna, at the Paris Conservatory, the Youth Piano Academy, and the Manhattan School of Music.