Born in Cologne, Müller-Brachmann was a member of the boys' choir Knabenkantorei Basel, where his musical talent was discovered.
He continued his studies of Lied with Dietrich Fischer-Dieskau in Berlin, on a scholarship of the Studienstiftung des deutschen Volkes.
He studied further with Rudolf Piernay at the Musikhochschule Mannheim[1] and took his concert diploma singing the role of Elijah in Mendelssohn's oratorio.
[2] Daniel Barenboim engaged him at the Berlin State Opera in 1998, where he stayed until 2011 and performed in many operatic roles, such as Masetto and Leporello in Mozart's Don Giovanni, the title role in his Le nozze di Figaro, Guglielmo in his Così fan tutte, Kaspar in Weber's Der Freischütz, and Escamillo in Bizet's Carmen.
[5] He recorded Mozart's Requiem with Philippe Herreweghe[6] Mahler's Eighth Symphony with Pierre Boulez,[7] and his Des Knaben Wunderhorn with Michael Gielen.