I have a recording of a mantra chanted in Chinese by women's voices with instrumental accompaniment, but I don't know its source. As far as I know (which isn't very far), chants of sutras (teachings of the Buddha), mantras (short strings of syllables with special significance), and prayers, accompanied at times by bells, gongs, and drums, are the only traditional "sacred music" in Buddhism. There are a number of modern arrangements of these chants that include instrumental music, but I don't think they are used in traditional practices. Of course, there are many many different branches and flavors of Buddhism, and someone more knowledgeable may be able to provide more accurate information.

Aloha,
Mark