What is "bron-yr-aur"

"Bron-Yr-Aur" is an acoustic guitar instrumental tune by English rock band Led Zeppelin, and, at two minutes and six seconds in duration, is the shortest studio recording under the band's name.

Bron-Yr-Aur ( Welsh for "breast of the gold", or by extension, "hill of the gold" or "golden hill"; ) is a privately owned 18th-century cottage, on the outskirts of Machynlleth, Wales, and best known for its association with the English rock band Led Zeppelin.