Thanks to all, finished it now. (Too tied up with parental care worries to think properly laterally about mum, despite the missing capital and my comments earlier about precision).
I'm suddenly reminded of working through a similarly-themed Araucaria with an opera-loving friend, to mutual satisfaction; then her immense frustration a week or so later when I directed her attention to the next themed Araucaria and she realised she was expected to know Britney Spears songs!
Nice one Maskarade, keep it up, and thanks again to all comrades here. Now (at last) to look at Everyman