Out of all the covers Nightwish ever did there is only three songs I can listen to over and over. What you posted simply because Pink Floyd is awesome and they're being covered by an equally fantastic band... another one was the Symphony of Destruction cover that I posted in the last thread.
This one is a cover of Gary Moore's Over the hills and far away, pay particular attention to 0:22.
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"I'm staunchly atheist, I simply don’t believe in God. But I'm still Catholic, of course. Catholicism has a much broader reach than just the religion. I'm technically Catholic, it's the box you have to tick on the census form: 'Don't believe in God, but I do still hate Rangers..'"