On their third album, In the Garden of Souls, Vas doesn't so much extend their sound as go deeper within it. Singer Azam Ali continues singing in tongues; she's an intoxicating priestess who invites you into terrain that's both sacred and sensual. Her voice is framed by her own hammered dulcimer and the percussion of Greg Ellis. He draws on a trap set that replaces tom-toms, snare drums, and cymbals with djembes, dumbeks, udu drums, chimes, and bells to surround Ali with a seductive swirl of throbbing percussion, while Cameron Stone adds sinewy, raga-like cello lines. You can hear the influence of Abbess Hildegard von Bingen's medieval chants on pieces like "Inamorata" and "Beyond Despair," while "Inward Coil" builds from a plaintive folk tune into a classical crescendo. Azam Ali's voice is a stunning instrument, hovering between the ululations of Iran, where she was born, and the extended, note-bending melodiousness of India, where she was raised. In a language of the imagination, she's revealing a glimpse of heaven. --John Diliberto