Timpani are also called kettledrums. These instruments crafted by Antonio Stradivari were, for a time, more kettles than drums. DEA Picture Library/De Agostini/Getty Images hide caption

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Soprano Catalina Cuervo, singing the role of Frida Kahlo, rehearses with bass baritone Ricardo Herrera, singing the role of Diego Rivera, on Feb. 21, 2015 at the Michigan Opera Theatre in Detroit. Veronica Zaragovia/KUT hide caption

itoggle caption Veronica Zaragovia/KUT

Soprano Pretty Yende in a Los Angeles Opera rehearsal. Starting Saturday, she'll be appearing in the company's production of The Marriage of Figaro. Corin Cates-Carney/NPR hide caption

itoggle caption Corin Cates-Carney/NPR