i think he's getting older... but please, let me explain before you shout at me! :P

jon has admitted he can not reach the higher notes he sung when he was young, and most bj songs are not specially easy to sing. when people get older, his voice gets older too, and they need to change they way they sing. there are a lot of examples of this, but take a look at one: david coverdale, from whitesnake.

for me, david is one the best vocalist ever. nowadays, his voice is not as good as it should, and he has changed the way he sings. i prefer the 'old voice', but the 'new one' is more mature, with more style. he cannot scream like he did in the past, but that don't means he is a bad singer. he has changed the way he sings the old tunes, but it still ok. this example can be applied to every singer go is getting older (well, maybe tom jomes is an exception )

in the last performance i was (bryan adams), mr adams lost his voice completely in 1 hour and a half. and that don't means he is a bad vocalist at all... but sometimes the age makes this kind of things.

the same can be applied to jon. i know the band has changed some songs, tune them to a lower note in order to make jon feel more confortable.

i think the problem is that we all get used to hear a song in a specific way, and when this change, we get confused.

but he is still a great vocalist, with a wide range of skills. i love when i heard him sing 'that's all right, mama'... sounds like if elvis was alive!

at last, let me say that a man who can stand more than 3 hours singin' cannot be a bad singer...