wind chimes

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun plural An arrangement of small suspended pieces, as of glass, metal, or ceramic, hung loosely together so that they make a pleasant jingling sound when blown by the wind.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A construction of small pieces of wood, glass, metal or ceramic suspended, outdoors, in such a way that they tinkle pleasantly when moved by the wind.