In February 1914 , the eleven-year-old prodigy made his concert debut , playing Joseph Haydn 's Cello Concerto in D major with the Vienna Philharmonic under Felix Weingartner .
In February 1914 , aged twelve , he played in his first concert , performing Joseph Haydn 's Cello Concerto in D with the Vienna Philharmonic conducted by Felix Weingartner .