Andreas Kratz started at early age to play under his fathers baton in Tranås Band of the Salvation Army.
1997-2001, Andreas studied trombone at the Academy of Music and Drama, University of Gothenburg with Professor Ingemar Roos. Between 2003-2017 Andreas worked as a Tenor & Bass trombonist at the Gothenburg Opera House.

Andreas also plays the euphonium and the bass trumpet.

Over many years Andreas worked with orchestras like:

Gothenburg Symphony Orchestra, Norwegian Radio Orchestra (KORK), Oslo Opera Orchestra, The Royal Opera Stockholm, Norrköping Symphony Orchestra, Trondheim Symphony Orchestra, Gävle Symphony Orchestra, Helsingborg Symphony Orchestra , Gothenburg Wind Orchestra, Musica Vitae, Jönköpings Symfonietta, NorrlandsOperan , Big Fat Brass (Liseberg Marching Brass), Brassa Nova Quintett, Dala Sinfoniettan, The Royal Band of the Swedish Army, The Royal Marine Band of the Swedish Army, Östgötamusiken Wind Orchestra.