From a musical family , Gerhardt is the son of a mother who sang coloratura soprano .
Son 's 's father , Axel Gerhardt , was a second violinist of the Berlin Philharmonic Orchestra for over 40 years .
From a musical family , Gerhardt is the son of a mother who sang coloratura soprano , and his father , Axel Gerhardt , was a second violinist of the Berlin Philharmonic Orchestra for over 40 years .