The beginning doesn't sound right, but skip to 00:47, and your ears will be filled with awesomesauce.
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Still the best Anime I have ever seen. This... remix I guess? of the SSS theme is one of the best things I have heard. It's louder than usual, so turn down your headset before pressing play. I didn't really like it at first but it grew on me completely and it's got a very strange aspect to it that I can't quite put into words. The music/OSTs in Angel Beats are the best, even better than Clannad's (With the exception of Toki wo Kizamu Utau/A song to pass the time - unparalleled in my mind) it's just a pity the only available OST is £50 or something obscene on Amazon :/