Just listen...

Sometimes, when I study, I take a minute to find some good study music. Sometimes, when I take a minute to look for some good study music, I forget that it was only supposed to take a minute...

If your attention span is really short, skip to 3:25 or so.
If it's even shorter, skip to 5 minutes or so.

.....but it's really better if you listen to the whole thing, so you can appreciate the buildup to the absolutely incredible climax. It's just one of those songs that you can really get lost in.