It is a noble ambition: blend science and sound to create audio experiences with the capacity to rejuvenate, calm, and even heal. The notion has circulated for millennia, and its origins can be traced deep into Hindu and Judeo-Christian traditions (the latter with its account of David soothing a troubled King Saul with his harp [I Samuel 16:23]). The Rosyln, N.Y.-based Relaxation Company, like Steven Halpern, has based its existence on the concept and makes persuasive arguments for its theories in the well-reasoned liner notes that accompany its handsomely packaged recordings. Let yourself get lost in the vocal ether concocted by Silvia Nakkach, whose specialty is exploring the space that connects notes (known as meend in North Indian music) and decide for yourself. The liner notes include suggestions for employing the music in self-guided meditations. --Terry Wood