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Don't know exactly why a large gathering of people singing in unison touches me...it just does. Here, 13,500 gather in Trafalgar Square for some karaoke fun all put together by T-Mobile. Don't make fun of me but I almost teared up. (Almost.) Did anyone notice Pink in the crowd? She was in on the act! Agency: Saatchi & Saatchi, London Copywriters: Steve Howell Art Directors: Paul Silburn…