By BEN SISARIO

LE MYSTÈRE DES VOIX BULGARES (Sunday) Formed in 1952 as the Bulgarian State Radio and Television Female Vocal Choir(but known since the '80s by this considerably sexier name, originally an album title), this group performs complex modern arrangements of traditional Bulgarian folk and Byzantine liturgical styles. The concept is high, but the effect of the pungently close harmonies and intense percussive yips is immediate and transcendent. At 7:30 p.m., Symphony Space, 2537 Broadway, at 95th Street, (212) 864-5400, symphonyspace.org; $30 in advance, $35 at the door.