Horowitz 's student , American pianist Byron Janis was among the concert 's attendees .
A special Tribute to Vladimir Horowitz gala concert was chaired by Donald Trump and hosted by the Academy Award Winner Julie Andrews .
Vladimir Horowitz 's student , American pianist Byron Janis was among the concert 's attendees .
A special Tribute to Vladimir Horowitz gala concert was chaired by Donald Trump and hosted by the Academy Award Winner Julie Andrews .