What is "uaithne"

In Irish mythology, Uaithne /ˈuənʲə/ is the harp which belongs to The Dagda. It is sometimes called Dur da Blá, The Oak of Two Blossoms, and sometimes Coir cethar chuin, the Four Angled Music.

After the Second Battle of Mag Tuired the Fomorians had taken The Dagda's harp with them. The Dagda found it in a feasting-house wherein Bres and his father Elathan were also. The Dagda had bound the music so that it would not sound until he would call to it. After he called to it, it sprang from the wall, came to the Dagda and killed nine men on its way.

"An Uaithne" is also the original name of Irish choir Anúna.