Erdmann sang in the children's chorus of the Hamburg State Opera in her youth. As a teenager she began studying singing seriously with soprano Evelyn Herlitzius (de) before entering the Hochschule für Musik und Tanz Köln where she was a pupil of Hans Sotin. She is currently a student of soprano Ingrid Figur (de). In 2002 she won First Prize and the Special Prize for Contemporary Music at the Bundeswettbewerb Gesang (Federal Singing Competition), and in August 2005 she was awarded the Luitpold Prize at the Kissingen Summer Festival and the Norddeutscher Rundfunk Music Prize at the Schleswig-Holstein Musik Festival. She sang Sempronia in the premiere of the critical edition of Apothicaire et perruquier at the Kurtheater, Bad Ems on 1 June 2007, with the WDR Rundfunkorchester Köln under Helmut Froschauer.
In July 2010, she created the role of Ariadne in the world premiere of Wolfgang Rihm's Dionysos at the Salzburg Festival, a role she is scheduled to repeat at the Berlin State Opera in 2012. In January 2011, she gave a lauded portrayal of Despina in Mozart's Così fan tutte at the Festspielhaus Baden-Baden. In October 2011, she made her debut at the Metropolitan Opera as Zerlina in the company's new staging of Mozart's Don Giovanni.
On 14 February 2013, Erdmann attempted to represent Germany in the Eurovision Song Contest 2013 with Die Priester singing a revised version of Ave Maris Stella. She finished 10th place in the national final.
- Louise T. Guinther (October 2011). "Sound Bites: Mojca Erdmann". Opera News 76 (4).
- "Mojca Erdmann – Biography". www.deutschegrammophon.com.
- Performance search, Boosey & Hawkes web site Retrieved 4 August 2013.
- Anthony Tommasini. "A Nietzschean Plunge Into Sensual Labyrinths". The New York Times.
- "Mojca Erdmann". www.operabase.com.
- "Die neue Bescheidenheit oder: Was bleibt von 2010/2011?: Wichtige Sängerinnen und Sänger". Opernwelt. October 4, 2011.
- Ronald Blum, Associated Press (October 14, 2011). "Review: One dull Don Giovanni replaces another". The Washington Times.
- Göran Forsling. "A treasure trove from more than one point of view". MusicWeb International.