Dante Gabriel Rossetti.
The Blue Closet.
1857. Watercolour on paper. Tate Gallery, London, UK. More. 
Lady Alice, Lady Louise,
Between the wash of the tumbling seas
We are ready to sing, if so ye please;
So lay your long hands on the keys;
Sing, Laudate pueri.
(From ‘The Blue Closet’, William Morris)