シュテルン音楽院
In 1899 Hollaender's family returned to Berlin. His father began teaching at the Stern Conservatory, where his son became a student in Engelbert Humperdinck's master class. In the evening he played the piano at silent film performances in local cinemas, developing the art of musical improvisation. By the age of 18 he was employed as a répétiteur at the New German Theatre in Prague and also was put in charge of troop entertainment at the Western Front of World War I.