Albert Robert Müller (Mueller) (born May 25, 1849 in Naumburg (Saale), February 24, 1909) was a German trombonist. Robert Müller Robert Müller initially received violin lessons and discovered his talent for trombone playing at the age of twelve. In 1866 he received a position at the city orchestra as a trombonist and bassist. This was followed by engagements in various orchestras (1867 Spa Orchestra Travemünde, 1867-1868 Mansfeld Orchestra Chemnitz, 1868-1869 Theater Lucerne and St. Gallen, 1869-1871 Tonhalle Orchestra Zurich, 1872-1874 Theater Strasbourg, 1874-1876 private orchestra in Lugano). In 1876, at the age of 27, he settled in Leipzig and became a member of the Gewandhaus - und Theaterorchester as well as a teacher at the Royal Conservatory of Music. He wrote a School for Trombone in 1902, technical exercises and études as well as practice-related music literature for his instrument.