"even Parsifal he had described as 'great fun'"
'The Temptation of Sir Percival' (1894)
Public Domain'The Temptation of Sir Percival' (1894) - Credit: Arthur Hacker

 Parsifal is a three-act opera by Richard Wagner. It is loosely based on medieval literature about the Arthurian knight Percival and his quest for the Holy Grail.  It is a very serious, religious work, beautiful but hardly "great fun".

Listen here to the prelude from Parsifal on Spotify.