One of Sweden’s best-known and widely performed composers, Karin Rehnqvist is just starting to make waves in the international community. A recent rave in Gramophone called her music “marvelous” and “stunning,” the sort of revelatory work that “requires one to discard preconceptions of what constitutes Western art music.” A highlight of this Portrait is her “extraordinary” song cycle, given its U.S. premiere by two Swedish singers specializing in Kulning, the extended vocal technique drawn from Nordic folk traditions. The entire evening will feature the remarkable Either/Or ensemble, who are among Rehnqvist’s greatest champions.