T-Mobile karaoke ad in Trafalgar Square - video report

LONDON - Campaign.tv takes a look behind the scenes at Saatchi & Saatchi's latest T-Mobile ad, which features a mass karaoke in Trafalgar Square, involving rock star Pink.

We speak to Saatchi & Saatchi joint creative partner Paul Silburn and show footage of Pink's performance.

Watch the video above.