** This expires today! **
"What better way to herald the end of the world than with a jaunty polka, you might ask? Well, not with just any old polka, but one featuring a contrabassoon, electric bass, French horn, violin, percussion, and, oh yes, an accordion - played by musicians plucked from Canada, England, Israel and the American Midwest. Apolkalyptic indeed!" -- iTunes Store
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the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.