Coldplay Wristband audience interaction

Recently Coldplay have been using wristbands which are controlled through radio signals as part of their show at arena gigs, shown below in use at Wembley during the X Factor final and in the video, an audience member at the Glasgow concert demonstrates how the audience experience is enhanced by the bands which create a sense of togetherness and interaction with the show.

An interesting and novel way of creating participation and a communal feel for audience members. This technology could be pushed further to react with all notes and beats automatically, or through tracking of position and different colours implanted within the lights could be used to display images when filmed from above.