Another connect question, though this is easier than the last.

W is a famous poet, who lived in England in the 19th century.


















X is a torture device invented in the late 18th century, although it was accrued to the Countess Elizabeth Bathory.

Y is a science-fiction author, whose book has been labelled one of the 100 best books of the 20th century.















Z is a famous world war 1 battle.


















When these four are connected, you get a very famous band, which redefined the genre of metal.
Identify W, X, Y and Z, and the band which connects them.