There's always an element of exoticism in world music when traditional dress is involved, as is the case with ensemble act Le Mystère des Voix Bulgares. But the amazing vocal feats pulled off by the singers in this large group of women render the genre's stigma irrelevant. The group (aka the Bulgarian State Radio and Television Female Vocal Choir) was established in 1952. However, the ladies didn't become "cool" till the 1980s when, following an introduction to the music from Bauhaus frontman Peter Murphy, 4AD founder Ivo Watts-Russell released two anthology albums that managed to reach young ears. The group's seesaw harmonics and polyrhythms should sound especially dazzling in Grace Cathedral, which rightfully boasts sumptuous acoustics.