This is a traditional Finnish song wich is singed before the summer breake.
It is called Suvivirsi
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7-7-5-3-2-3-5-7--7-10-10-8-8-7--| X2
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[ Tab from: http://www.guitaretab.com/m/misc-traditional/86314.html ]
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10-12-10-8-7-5-5--7-8-8-7-7-5--5-7-5-3-2-0-0--0-2-5-5-4-5-|
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Thats it!Have fun playing.