Interesting topic.
I'd argue U2 never evolved but rather that they tried to force some type of change in their style with Zooropa and Pop. It wasn't really organic and they basically morphed back into their original form thereafter.
I think Red Hot Chili Peppers evolved. I won't argue for better or worse, but they definitely took a turn with Blood Sugar and were no longer the band that produced Mother's Milk and the prior efforts.
One of my favourites, PJ Harvey, has been doing very strong shape shifting her whole career. I think her last 2 efforts have been in the top 3 of her albums but the tone and narrative of the music has changed significantly from Rid of Me and To Bring You My Love days.
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