Bartelmann started playing the piano at the age of 8 during a Christmas church service. After that he took classical piano lessons for 10 years and mastered his craft. Although he studied classical music, Bertelmann had interest for various kinds of music genres. He found a rock band at the age of 14. In 1992, Bertelmann and his cousin formed the hip hop duo God's Favorite Dog. They have released an album and performed both nationally and internationally with God's Favorite Dog. In 2004, Bartelmann started to make music under the alias Hauschka and released his first critically acclaimed album Substantial.
Throughout his career, Hauschka often combined various instruments and used electronic structures to create his unique blend of sound. His brilliance can often be seen in his extraordinary improvisations.
Apart from his studio albums, Hauschka composed original music for several movies. In 2012, he composed music for Doris Dörrie's Glück and in 2015 he also composed for Craig William Macneill's The Boy. He also has a side project called Music A.M. The band consists of Stefan Schneider of To Rococo Rot and Luke Sutherland of Long Fin Killie.