Whose song is O Walther, der du also sangest?

Artist		Album
Metropolitan Opera New York
Orchestra e Coro del Festival di Bayreuth
Wagner (Barenboim)
Windgassen, Brouwenstijn, Wilfert, Greindl, Dieskau
Windgassen, Silja, Waechter, Bumbry, Greindl, Crass, ...