http://youtu.be/UJqnGpkaqrM With every triumph, there comes a sacrifice. Happiness is always dampened by this discouraging reality. And so, a bittersweet note resounds in the air as the Doctor wins the battle at Trenzalore. This Time Lord, who has lived for almost two thousand years, looks wistfully upon his past, accepting the inevitable - that as times change, so must he. The song's undulating mood emphasises the hopeful outlook that the Doctor exudes despite the tears that percolate in his eyes. Almost every listener reliving Elevens regeneration will be flooded with this same set of clashing emotions. In a sense, though, Infinite Potential, is almost too optimistic, as if its knowingly consoling those who feel the emptiness and loss of the Eleventh Doctor leaving our screens. So it seems that, in these situations, there are only the extremes of joy and moroseness, and music is - without a doubt - capable of making us exhibit both simultaneously. And perhaps, just this once, fans can feel at peace with Elevens untimely departure, without that regret snagging our expectations for the next Doctor in line. After all, he is the Doctor who forgives and forgets. Dwelling on the past never suited his ever-changing perception of "coolness". Yet, as the music lulls to a quiet murmur, everybody knows that its time to say goodnight to their whimsical, raggedy Doctor. It all just disappears, doesn't it? Everything you are, gone in a moment. Like breath on a mirror.