Wrigleyville is transformed into Margaritaville as Jimmy Buffett, his band, and many thousands of his dancing, beer-guzzling, Hawaiian shirt-wearing, lei-draped fans invade the venerable Chicago baseball stadium for Live at Wrigley Field Double Header. Held over Labor Day weekend, 2005, the concerts themselves (a daytime show occupies one disc, with a nighttime set on the second) are standard Buffett fare--i.e., another opportunity for the above-named "Parrotheads" to pah-tay--but as the singer-...