The experience to be had at Gypsy Tea Room on Sunday night most certainly will be. New York's Hem might be that city's most unlikely treasure: a loose outfit of urban hipsters whose gorgeous alt-country lullabies pack nearly as much sonic depth as Sigur Rós' icy post-rock. Rabbit Songs, their terrific CD, is a study in intricate studiocraft, a lush swirl of overlapping acoustic guitars, gentle piano, lightly brushed drums and singer Sally Ellyson's spine-tingling singing; what's really great is that the band can reproduce it onstage, maneuvering a miniature ocean of sound that swallows anyone in its path. Highly recommended for whatever anxieties or sorrows you may have to drown.