Armin recently created the role of Philippus in Ita Vivam, a new opera by Christina Athinodorou, at Guildhall, and was selected for Academie Europeenne, Ambronay, in September and October 2005 to perform the role of 'Dom Carlos' in Campra's 'L'Europe Gallante' with William Christie on European tour.

Other operatic roles include Dorilas in Charpentier's 'Le Malade Imaginaire' Prologue with the Guildhall School of Music, chorus in the Guildhall production of Nielsen’s Maskerade, and Matt in the ENO/Baylis production of Kurt Weill’s Threepenny Opera. He has appeared as soloist in Brahms’ German Requiem in London, Haydn’s Creation in Wolverhampton and in Bach’s St John Passion in Rome and Umbria, as well as singing Bach’s B Minor Mass under Richard Egarr at Snape Maltings as a member of the Britten-Pears Young Artist Programme in 2003.