I should add one thing: While I do not agree Bono no longer uses his falsettos (emperical evidence suggests otherwise, after all!), I will say his falsetto is no longer as strong. It has become more difficult for him to nail the falsetto during live performances (look at 'With or Without You' from Boston for an example), and it no longer resonates as deeply as it did before in my opinion. By that I mean, it sounds a little thinner, a little more sharp. This can be said of his overall voice, too. It's not that he can't hit the high notes as easily - as he still can (just listen to 'Vertigo') - it's more that the resonation and depth isn't quite what it used to be (compare the exact same notes he hits in 'Lady with a Spinnng Head' to that of, say, 'Elevation'. In the former, his voice is coming from a different place, one in which we get the feeling he could reach at any time for an entire gamut of registers, which is not so much the case in the latter.