The Empty Child Recap (Westminster Bridge Variant) - Doctor Who Unreleased Music
I absolutely adore this track. It's a lower key variation of Westminster Bridge with some incredible percussion. This particular version only ever played once, during the previously trailer for The Empty Child at the beginning of The Doctor Dances. I think the lower key of what was at first an upbeat track at the start of the series helps show the darker turn the series takes towards its later half.