Teitur wrote a seven-piece song cycle for choir and orchestra called "Weekdays", which was performed in late 2011 by the Danish National Symphony Orchestra and the DR Girls choir in Copenhagen. In 2012, Teitur performed live across the Netherlands with the Netherlands Wind Ensemble, while a film was shown which he commissioned and composed the score to, directed by Thomas Koba, under the title "Everyday Song", with additional music composed for the live show by Trondur Bogason. They also performed as part of the Copenhagen International Documentary Festival (CPH:DOX). During 2012, Teitur composed the music for the yet to be released indie film The Load directed by Kristian Sonderby. In 2013, he wrote music to the sonnet requiem "Sommerfugledalen" by Inger Christensen for full choir, piano and strings. The 30-minute piece was premiered in Holstebro with 100 young choristers in celebration of the 75th birthday of the Holstebro Gymnasium og HF, where Teitur was a student. The same year, Teitur appeared as a singer with the Danish National Symphony Orchestra in a new Danish requiem by composer John Frandsen with words by Simon Grotian. Teitur sang six songs solo with organ. The requiem premiered in Koncerthuset in April 2013. In 2015, Teitur wrote "Romeo Answers (Songs from Juliet Letters)" for Messer Quartet. The piece for voice, string quartet and computer voices is 23 songs based on Juliet Letters, letters administered by Juliet Club (Club di Giulietta) that writers send to Shakespeare's Juliet in Verona. The concept is influenced by Juliet Letters an album by Elvis Costello and Brodsky Quartet released in 1993. The piece was premiered with electric strings in Engelsholm castle, Denmark in August, 2015. In 2017, eight of Teitur's songs were integrated in the hymnal of Church of Denmark, Kirkesangbogen. In 2017, the album Ich bin das Chaos was released by Judith Holofernes. Teitur was the co-writer of nine songs and co-produced and arranged the album as well as playing guitar, piano and synths. The album debuted at no. 13 in the German chart. In 2018, Teitur released Running Music together with Mads Bjørn which is electronic music for running, fitness and movement. The album went to no. 1 on Danish Electronica charts on iTunes. In 2019, Teitur appeared in the Danish TV series Toppen af Poppen, performing songs by six other well known artists, who also performed songs originally recorded by Teitur. In September 2019 the success