Picard: They're composers, Worf, ...from the nineteenth century. Data was rehearsing a production of H.M.S. Pinafore just before he left.
(singing) 'A British tar is a soaring soul, as free as a mountain bird. His energetic fist should be ready to resist a dictatorial word.'
Sing, Worf, sing! (definite LOL at Worf's shaking his head 'no!')
(singing)His nose should pant'...