Jim Cole & Spectral Voices' music features harmonic overtone singing: each vocalist sings two or more notes at once.

Spectral Voices' music has been described as mystical, wondrous, achingly poignant, contemplative, ethereal, relaxing, transcendent, hypnotic, powerful, primal, soothing, intense, meditative, and sublime...  

Click on the link below to read about Spectral Voices and hear their music: