Description on Youtube:
An excerpt from a film (1986) by Jean-Pierre Ponnelle of Mozart's first opera seria "Mitridate, re di Ponto", composed when Mozart was just in 14 years old. Aspasia (soprano) was in this recording Yvonne Kenny and the role of Mitridate's son, Sifare (also soprano), was sung by Ann Murray (originally the boy role was composed for castrato). The Concentus Musicus Wien was conducted by Nikolaus Harnoncourt. Available in DVD (DGG 2006).