There's a piano, open for anyone to play, in the Piazza right now.
It's part of an art project called Street Pianos: 30 of them are installed in various locations (mostly outdoors) around London until 13 July. It's meant to encourage community spirit, with some singalongs and impromptu performances.
The street pianos all come with songbooks, and in some locations the songs are chosen to reflect the location. The songbook for Bank's piano, for instance, has songs including Money, money, money and We're in the money.
Sadly, the one here at the British Library just has the standard songbook selection (Dancing queen, Walk on by and so on). We think it should have songs related to the Henry VIII exhibition. Here's a few suggestions:
First cut is the deepest
D.I.V.O.R.C.E.
Kiss me Kate... Anne, Jane, Anne, Kate and Kate
I could not love you, More
Subterranean Romesick blues
No doubt you can do better... or worse...