Wagner Siegfried Idyll Bruckner Symphony No 7 Lothar Koenigs and the Orchestra of Welsh National Opera will open your ears to the beating heart that is Bruckner's Symphony No 7, a work filled with glorious, moving music. This symphony is infused with a sense of loss and mourning as Bruckner marked Wagner's death. Wagner's Siegfried Idyll is one of his most intimate and personal works. This short bewitching piece was first performed as a birthday present to his wife Cosima. Musicians played this touching piece on the stairs outside her bedroom as she awoke.