Elīna Garanča is easily one of the world’s premier mezzo-sopranos—a “one-in-a-million” voice, according to The Independent. She’s a thoughtful and sensitive song interpreter with an inquisitive approach, as evidenced in this eclectic program of songs by Rachmaninoff, R. Strauss, and rarely heard Spanish composers who championed the zarzuela, a genre of Spanish operetta that often focused on working-class characters. Hear something new sung with “grace and power.”