Rush is the only one of those 2007 groups on the summer circuit this year, with Waters set to begin touring in the fall.

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At this moment I cannot exactly say when I will return to competitions but I have not completely ruled out the entire summer circuit or the European Championships in Barcelona.

CNN: Isinbayeva to take break from pole vault

In 2007, the four musicians met on the summer festival circuit and hit it off immediately.

NPR: Newport Jazz 2008: The Monterey Quartet