Opening song to one of my favourite musicals, told both in reverse (Cathy's songs) and forwards (Jamie's songs) only meeting up at one point of true happiness for a duet before continuing their respective chronologies.
Interesting. You could try the official Vevo website link: http://www.vevo.com/watch/JPPO81500836. Can't find an alternate link anywhere else though aside from the preview version of the song.