Paul Winter's "Missa Gaia/Earth Mass" (1982) is described as "a masterpiece of New Age ecological consciousness that celebrates the sacredness of land, sky, and sea". His work on the East Coast is considered to be one of the most important musical expressions of new-age spirituality. On the West Coast, musicians concentrated more on music for healing and meditation. The most notable early work was Steven Halpern's "Spectrum Suite" (1975), the musical purpose of which was described as to "resonate specific areas of the body... it quiets the mind and body", and whose title relates "to the seven tones of the musical scale and the seven colors of the rainbow to the seven etheric energy sources (chakras) in our bodies". In the 1970s his music work, and the theoretical book "Tuning the Human Instrument" (1979), pioneered the contemporary practice of musical healing in the United States.