This winter, Great Performances shines a spotlight on international music icons Maria Callas and Vladimir Horowitz with two concert documentaries exploring the stories behind the most remarkable performances of their lives, premiering Fridays, January 15 and 22, 2021 at 10 p.m. on PBS (check local listings), pbs.org/gperf and the PBS Video app. Both films are introduced by Peter Gelb, currently General Manager of the Metropolitan Opera, as well as Vladimir Horowitz’s former manager. In 1964, opera sensation Maria Callas hadn’t performed in more than two years due to her tumultuous personal life. Critics were concerned that she had lost her voice until she made her return with a sensational performance at Royal Opera House in London’s Covent Garden. And more than 60 years since his departure from Russia, legendary pianist Vladimir Horowitz finally made his homecoming return in April 1986 with a concert at the Great Hall of the Tchaikovsky Conservatory in Moscow.