The band have had to pull their Main Stage performance because frontman M Shadows – real name Matt Sanders – is suffering from vocal problems.
"We're very sorry to tell you that Avenged Sevenfold will not be performing at Reading today, August 24. As many of you know, the band had to shorten their set at Leeds on Friday due to vocal strain. Since then, Matt's doctors in the United Kingdom and Los Angeles have both advised him that he must rest his voice and cannot perform," the band explained in a statement.
They added that their singer should be on the mend, and they hope future dates will not be effected.
"Thankfully there are no long-term problems and with proper rest, Matt will return to the road shortly. The band toured all summer with Iron Maiden throughout Europe and the UK. They returned home August 1, but because they wanted to play Reading and Leeds very much, they returned this week for the festival. They were blown away by the number of fans who came to see them play at Leeds. The band is still in England now and is extremely disappointed that they can't play a show they have been looking forward to for a long time."
The band are expected to return to the UK at the end of 2009.
As with Slipknot, who dropped out of today’s bill earlier in the week, organisers will not be adding any new bands to the bill, but are working out an alternative running order.
source from : www.nme.com