Widor's Toccata - or - Widor's 5th Symphony in F - Movement V - Toccata
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Full Symphony - http://www.youtube.com/view_play_list?p=3B1FEB74F427013E&playnext=1 The fifth and final movement-often simply Toccata-of Charles-Marie Widor'...

It just sounds so joyful, never fails to make me smile!