For example, thousands of Britney Spears Femme Fatale tour tickets were sold near to the date at a 50% discount - a pair costing just £60 with the deal. Other artists that have recently sold cut-price tickets on Groupon include: Bon Jovi, Snoop Dogg and JLS.

Mark Pearson, founder of My-vouchercodes.co.uk, said: "The music industry is naive to think that discounting won't reach the sale of concert tickets... We expect [discounting]."

"Surely filling a venue creates a good atmosphere for ...