Last weekend's Live Earth global music concert produced disappointing ratings figures in the U.K., where total viewers averaged barely a quarter of those who tuned in for the Concert for Diana a week earlier. The BBC attributed the low ratings to competition from its coverage of the Wimbledon tennis tournament. It also acknowledged that it received numerous complaints about use of the f-word by performers during the concert. "We asked artists not to swear but sometimes they get carried away," a BBC spokeswoman said. "We are very sorry for any offense caused." She added: "It was technically all-but-impossible to broadcast with a delay. It was called Live Earth and it was always intended to be broadcast live."