New York Festival of Song, led by Artistic Director Steven Blier, continues its 2021-22 Mainstage Series with “Love Songs in 176 Keys: 4 hands, 4 voices, 4 countries” at Merkin Hall, co-presented by Kaufman Music Center. The concert features Caramoor’s 2022 Vocal Rising Stars, including mezzo-soprano Natalie Lewis, tenor César Andrés Parreño, soprano Meredith Wohlgemuth, baritone Seonho Yu, and pianist Francesco Barfoed, performing love songs from Germany, Spain, France, and the United States by Brahms, Fauré, Milhaud, Gershwin, and others. Each country’s “chapter” begins with a virtuoso duo-piano overture. Pianist Bénédicte Jourdois joins Steven Blier as co-director and pianist for the performance.