Sunn O))) will be shacking the foundations of the Tivoli in Utrecht on the 20th of October.

The nice people of Tivoli gave us 2×2 tickets to give away to YOU: our dear readers of our humble blog.

So if you can tell us where the name Sunn O))) comes from, you can win free tickets to get your eardrums pierced.
(Note: two answers are correct)

E-mail the answer(s) and your full name to win AT incubate DOT org and winnnnnnn!