Edgars Ošleja made his debut on the stage of the Latvian National Opera in 2015. Among the roles he has interpreted for the LNO are Sarastro in the Little Magic Flute, Reinmar von Zweter in Tannhäuser, Colin in La bohème, the Blind Man in I Played, I Danced, the Keeper of the Madhouse in The Rake’s Progress, and the White Priest in Turandot. In February 2020, Edgars Ošleja made his debut, as Colin in La bohème, on the stage of the Prague National Opera where he proceeded to sing Angelotti in Tosca, Banquo in Macbeth, the High Priest in Nabucco and Pharaoh in Aida. Ošleja has performed in concerts of academic music at the Sigulda Opera Music Festival, Riga Latvian Society House, Riga Anglican Church, and elsewhere. Accompanied by the Prague Opera Orchestra, he has sung the bass solo in Beethoven’s 9th Symphony. In 2021, he took part in the premiere of Imants Kalniņš’s opera Matīss, kausu bajārs.  Ošleja’s repertoire includes arias and songs by Kaldár, Tchaikovsky, Handel, Verdi, Mozart, Prokofiev, and other composers.