I mean try to find a different style of singing, instead of always singing every song through the nose.
By this I don't mean that they should turn Wanted into a country song, i'm just thinking of a similar tone, something that still sounds good and doesn't come through the nose
Instead of this : "I'm cow...(barely whispers the rest of the word) on a stiiiiil horse iiiii riiiiidee, wanted dead or halaaaiiiiiiivvvv.
I tried singing it like Jon did in this performance and I find it very hard to reproduce his whiny tone.
Anyway I'm guessing that Rdkopper is right, he does this for longevity, maybe otherwise he can't freaking sing anything.