Rachmaninov’s All Night Vigil (also known as the Vespers) is one of his most remarkable works. Consisting of 15 short movements (6 vespers and 9 matins) drawn from the Russian Orthodox liturgy, it is moving in its intense inwardness and fuses fusion musical sources that include various Russian chant styles and traditional folk music. The whole overflows with melodic richness and an incredible range of choral colors and textures. Western choirs have captured various elements of the piece, but it’s best heard from a full-throated, bass-oriented Russian chorus, or, failing that, from an Eastern European ensemble versed in the style. That description certainly fits these Estonians, whose Slavic timbre and emotional identification deliver the goods. Listen to the choral basses plumb the deepest depths at the end of “Lord, Now Lettest Thou” and you’ll be hooked. Even if you prefer a larger chorus than this 30-voice chamber choir, it makes up in transparency what may be missed by sheer numbers. Rachmaninov often subdivides the chorus and invests appropriate numbers with decidedly unchant-like rhythmic drive. Hillier’s flowing interpretation unites the score’s variety and inwardness, and the small but important alto, tenor. and bass solos are done to a turn. This is a must.