American blues has held a fascination for British rock bands ever since Mick Jagger, Keith Richards and Eric Clapton heard their first Muddy Waters and Howlin' Wolf records.
Throw in other oldies but goodies Jimmy Buffet and Pink Floyd alum Roger Waters, along with country superstars like Keith Urban and husband-and-wife team Tim McGraw and Faith Hill, and Summer '07 is a paradise for scalpers.