I really love this scene...just the action of him getting the drop of rain, seeing his past (great animation btw), realising the horror and then finally having that sad breakdown...until the Soothsayer says:
'Your story may not have such a happy beginning, but that doesn't make you who you are. It is the rest of your story, who you choose to be...'
Then the music rises to extreme new heights and it's just soooo emotional and epic at the same time...
'So...Who are you Panda?'
'I am Po...and I am gonna need a hat!'
Powell outdid himself for this score (and yes, I think it's mostly Powell's work), I just love it!