Child orchestra players amazingly disappear one by one in this National Lottery video - but why?

The children, from the Ethnic Contemporary Classical Orchestra (ECCO) in Kensal Rise, star in a video to highlight the thousands of opportunities created for young musicians in the UK by National Lottery funding. The short film imagines what life might be like for the 23-piece music group if they had never received National Lottery funding.

It all starts off normally... a conductor, a full children's orchestra, but then something goes horribly wrong. You'll need to watch right to the end to hear the tuneless reason for this event.