Ann Hallenberg has established herself as one of Europe’s leading mezzo-sopranos. She regularly appears in opera houses and festivals such as Teatro alla Scala Milan, Teatro La Fenice Venice, Teatro Real Madrid, Theater an der Wien, Opernhaus Zürich, Opéra National Paris, Théâtre de La Monnaie Brussels, Netherlands Opera Amsterdam, Bayerische Staatsoper München, Staatsoper Berlin and the Salzburg Festival.

Her operatic repertoire includes a large number of roles by Rossini, Mozart, Gluck, Massenet, Handel, Vivaldi and Monteverdi.

Equally at home on the concert platform she frequently appears in concert halls and festivals throughout Europe and North America. She has built an unusually vast concert repertoire that spans music from the early 17th Century works up to contemporary music. 

Ann Hallenberg has worked with conductors such as Fabio Biondi, Ivor Bolton, William Christie, Teodor Currentzis, Sir John Eliot Gardiner, Emmanuelle Haïm, Daniel Harding, Nikolaus Harnoncourt, Paavo Järvi, Louis Langrée, Andrea Marcon, Cornelius Meister, Marc Minkowski, Riccardo Muti, Kent Nagano, Sir Roger Norrington, Sir Antonio Pappano, Evelino Pidò, Christophe Rousset and Alberto Zedda.

She has recorded more than 40 CD and DVD with music by Bach, Handel, Vivaldi, Mozart, Haydn, Gluck, Rossini, Mendelssohn, Brahms and Bruckner, just to mention a few. At the International Opera Awards in London in May 2016 her solo-CD "Agrippina" won the award for "Best Operatic Recital". This was her second win in the category, having also won in 2014.