Recommended: Install via Wi-Fi. App is Free with one song, rattle and drum. More songs available for. 99¢ apiece. Binaural alpha and theta inducing, 432Hz, meantone temperament, organic music specifically designed for: Meditation. Hypnotherapy. De-stress and Relax. Excellent Sleep Aid. Shamanic Journeying. Astral Projection. Brainstorming and Problem Solving.