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The gala recital drew on Callas' vast repertoire to include arias such as "Casta Diva" from Bellini's "Norma", "Miserere" from Verdi's "Il Trovatore" and a fully-staged performance of Act II of "Tosca".

Several of his pieces reflect the importance of Byrd, most explicitly “Two Motets,” an orchestration of “Bow thine Ear” and “Miserere mei, Deus.”

It began with the chorus, conducted by Pacific Chorale Artistic Director Robert Istad, in the brief a cappella “Miserere mei, Deus,” written for the Sistine Chapel likely in 1638.

But “Fiat Lux” is something far beyond and above Allegri, a composer only known for his “Miserere,” or early Strauss.

Domine Fili unigenite, Jesu Christe; Domine Deus, Agnus Dei, Filius Patris, qui tollis peccata mundi, miserere nobis; qui tollis peccata mundi, suscipe deprecationem nostram; qui sedes ad dexteram Patris, miserere nobis.