Share 'Für P.'

Dear all, Tried to make another piano track. The first part has another tempo (bpm) than the second part, is this strange to do in piano music? Or can you use as many different tempo's in one song as you want? I don't think it sounds disturbing, but because I've been working on it for a while, maybe my ears don't hear it that good anymore. The download link can be found below: http://www.4shar…