Pure Moods, Vol. IIIAmazon. com What's most surprising about the Pure Moods series is not that it is so popular, but that the music on it actually represents some of the best New Age and modern instrumental music, rather than scraping the barrel. For every piece of Enya pop froth like her "Only If," which opens the album there is a deep and impassioned exploration like Sheila Chandra's virtually a cappella "Ever So Lonely Eyes Ocean." Yanni's bombastic "On Sacred Ground"