Joyce Barker
Returning to the UK , she performed in several productions with Sadlers Wells and at the Royal Opera House which included major roles in "Götterdämmerung" and "Die Walküre" ( Wagner ) , "Mefistofele" ( Boito ) , and "I Lombardi" , "Nabucco" and "Aida" ( Verdi ) . 
<triplet> Götterdämmerung <subj> Wagner <obj> composer <triplet> Die Walküre <subj> Wagner <obj> librettist <triplet> Mefistofele <subj> Boito <obj> composer <triplet> Boito <subj> Mefistofele <obj> notable work <triplet> I Lombardi <subj> Verdi <obj> composer <triplet> Nabucco <subj> Verdi <obj> composer <triplet> Aida <subj> Verdi <obj> composer <triplet> Verdi <subj> Nabucco <obj> notable work <subj> Aida <obj> notable work