The repertoire of Finnish baritone Aleksi Koponen ranges from Wagner, Bach and the Second Viennese School to contemporary composers. 

His recent operatic roles include ALBERICH from Der Ring des Nibelungen, the title role of Verdi’s MACBETH, Tosca’s SCARPIA , OREST from Elektra, FATHER from Hänsel and Gretel, GUNTHER from Götterdämmerung, DONNER from Das Rheingold, and IBN-HAKIA from Iolanta.

He is one of the founding members of PARTIMENTO ENSEMBLE, a baroque quartet with a core repertoire of Bach cantatas. In addition to the ensemble, he frequently sings as a soloist in the major oratorio repertoire. 

He works closely with pianists focusing mainly on Russian and German lieder. Concerts have included song cycles of Mussorgsky, Shostakovich and Wagner, as well as Schönberg, Neuwirth, and the three great Schubert song cycles. 

He particularly champions new music and welcomes any opportunities to sing new work. He has commissioned and given premieres of pieces from several living composers, most recently CN Lester, J Diaz, Matthew Lee Knowles, Alexandre Naoumenko and Jacob Bride. He created the role of Pozzo for 'You Don't Know What Our Twilights Can Do', Will Gardner's new commission for Green Opera. 

He studied in London with Neil Baker, Bonn with Aris Argiris and Berlin with Gundula Hintz and in 2025 was granted a scholarship from International Gesangsstudio Berlin e.V. under the tutelage of Aris Argiris of Universität der Künste Berlin.