What anime had a great atmosphere?

IMO, death note did an awesome job at building the correct atmosphere for the show. What show that you watched did that well? http://ift.tt/1MxJSiy

What's your favourite opening?

I really like JoJo's opening, Death Note's first opening, death parade's opening and code geass first OP (the second one is horrible though). What's your favourite? http://ift.tt/1VExTCi