Niklas Spångberg started his musical career in the Cantores Minores boy choir. After first graduating as master of science (technology), he started studying singing at the Sibelius Academy soloist department under the guidance of Erkki Rajamäki. Other teachers during his years of study were Jaakko Ryhänen, Irina Gavrilovici, Enrico Facini, Raimo Laukka and Mikko Pasanen.

Spångberg has been a frequent guest on concert stages around Northern Europe, as well as an orchestral soloist. He has also regularly visited the leading Finnish opera stages, the Savonlinna Opera Festival and the Finnish National Opera. Other stages around Finland to welcome Spångberg have been in Tampere, Turku, Vaasa, Oulu, Pori, Ilmajoki, Eurajoki and Mariehamn. Aside from Finland, Spångberg has also performed in Sweden, Russia, Estonia, and Germany.

Spångberg’s repertoire includes basso roles in many central operas, such as Filippo, the Monk, and the Inquisitor in Verdi’s Don Carlos, Sparafucile in Rigoletto, Gremin in Tchaikovsky’s Eugene Onegin, Sarastro and Speaker of the Temple in Mozart’s the Magic Flute, Il Commendatore in Don Giovanni, Bartolo in Le Nozze di Figaro, Colline in Puccini’s La Boheme, Timur in Turandot and Angelotti in Tosca, as well as Alberich in Wagner’s Götterdämmerung.

Spångberg is also often heard in works by more modern composers. Aside from music by Benjamin Britten and Peter Maxwell Davies, he has performed works by Scandinavian composers such as Uljas Pulkkis, Ilkka Kuusisto, Aulis Sallinen, Tuomas Kantelinen, Pehr-Henrik Nordgren, Olli Kortekangas, Mikko Heiniö, Timo-Juhani Kyllönen, Sauli Huhtala, and Stefan Lindgren.

In addition to his stage repertoire, Spångberg also sings many large choral works, such as Verdi’s Requiem, Handel’s The Messiah, Beethoven’s Ninth Symphony, Puccini’s Messa di Gloria and the Passions and Christmas Oratorio by Bach.