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The blues song "Call It Stormy Monday (But Tuesday Is Just as Bad)" has the line "the eagle flies on Friday, and Saturday I go out to play".Friday was payday for laborers all across the U.S. in 1947 when this song was written. The 50 cent and quarter coins that laborers found in their pay envelopes showed eagle images on their back sides during this era. 1947 was actually the last year that the eagle showed up on the half dollar coin.When workers paid for their fun during Friday night parties the evening of payday, you could say that "the eagle was flying" whenever they threw coins to a bartender to pay for a drink.