Mick Jagger and the boys wouldnt get out of bed for 9 million. The Stones "Bigger Band " tour grossed over 500.000.000 dollars.
www.nme.com/news/the-rolling-stones/25204
This was 2005/06/07.
The tours total gross made it the highest grossing tour ever.
en.wikipedia.org/wiki/A_Bigger_Bang_Tour
Of course if ABBA were to reform tomorrow i think the record books would have to be rewritten just a little.The earnings from that one would make the Rolling Sones look like the Arctic Monkeys.
By the way you can get string for a quid at Poundland.