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While using the app on a recent morning, I encountered the music of Hildegard von Bingen, a 12th-century Benedictine nun and composer of Gregorian chants.

Between the two versions of “Spiritus sanctus vivificans vita,” an antiphon by Hildegard von Bingen, for example, or between that antiphon’s simplicity and the angular density of George Enescu’s “Fantaisie concertante.”

The first half of her program borrowed some numbers from her debut solo album, “Enargeia,” released last year — but now in new company, like the two austere songs by Schoenberg that followed Hildegard von Bingen’s “O frondens virga,” a sober introduction.

Los Angeles Master Chorale The vocal ensemble led by Artistic Director Grant Gershon makes a triumphant return to Disney Hall with a pair of concerts featuring works by Morten Lauridsen, Hildegard von Bingen and Reena Esmail, among others.

When, around 4 p.m. on Sunday, June 6, the bells of Washington National Cathedral ring out over Northwest Washington carrying Hildegard von Bingen’s “O frondens virga,” will anyone within earshot pause to wonder by whom the bells toll?