Gurre-Lieder, Part II: no. 1: "Herrgott, weißt du, was du tatest" (Waldemar) by Yvonne Minton , BBC Singers , Jess Thomas , Kenneth Bowen , Goldsmiths Choral Union , BBC Symphony Chorus , Marita Napier , Siegmund Nimsgern , Günter Reich , BBC Symphony Orchestra , Pierre Boulez