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Could it be Muse?

"Butterflies And Hurricanes"

change,
everything you are
and everything you were
your number has been called
fights, battles have begun
revenge will surely come
your hard times are ahead

best,
you've got to be the best
you've got to change the world
and you use this chance to be heard
your time is now

change,
everything you are
and everything you were
your number has been called
fights and battles have begun
revenge will surely come
your hard times are ahead

best,
you've got to be the best
you've got to change the world
and you use this chance to be heard
your time is now

don't,
let yourself down
don't let yourself go
your last chance has arrived

best,
you've got to be the best
you've got to change the world
and you use this chance to be heard
your time is now

(Sorry for the lack of capitalization. I copied/pasted it from a lyrics site. )

Took ten seconds. You find a search engine, type in what lyrics you understood followed by the word "lyrics", hit enter, and there you go! In this case, I typed in "be the best change the world lyrics", and then it was just a matter of scanning the results. In all actuality, I've barely even heard of Muse, couldn't tell you a single song they sing if I was to hear it, and I don't recall ever hearing the song in question.

Glad to help.