Looks like the Yeah Yeah Yeahs are variety people …
If you read this article, you see they each have side projects, other musical interests and they do not devote full time to the Yeah Yeah Yeahs. And it sounds like their lives and their work are the better for it.
http://www.nytimes.com/2013/03/31/magazine/get-yer-yeah-yeah-yeahs-out.html
Variety People 
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