Another of the bands taking part is Faithless and one member, Jamie Catto, told the BBC why he wanted to get involved.

BBC: Drummers gather at No 10 for Sudan peace campaign

Up to 35, 000 revellers attended the festival on each day last year, when the likes of Travis, REM, Roxy Music, Razorlight and Faithless were on the bill.

BBC: NEWS | Entertainment | Coldplay headline island festival

Over time, however, Parliament has shown an impressive flexibility in order to allow both the faithless, and members of faiths other than the established one, to take their seats.

ECONOMIST: Abandon oaths all ye who enter here

Along the way, Elizabeth meets first a drunken cop (David Strathairn) and his faithless wife (Rachel Weisz), then a gambler (Natalie Portman) who has a smart plan and a need for company.

NEWYORKER: My Blueberry Nights

But our problem is that we are faithless.

NEWYORKER: Magda Mandela

Nothing in the constitution requires these electors to vote the same way as their population did on 7 November - and seven times in the last 52 years so-called "faithless electors" have indeed made the switch.

BBC: Bush and Cheney

"If there appears to be a tie, then faithless electors become a big problem, and we could have a real mess on our hands, " said Robert W. Bennett, a constitutional law professor at Northwestern University who has written extensively about the Electoral College.

CNN: Electoral College tie possible in Obama-Romney race