Biography
There are (at least) five artists using this name:
1) Polina is a Russian singer/songwriter.
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2) Polina is a screamo/hardcore group from Newfoundland, Canada featuring former members of Narrators.
myspace: http://www.myspace.com/polinapolina
3) Polina is a bulgarian chalga singer.
4) Polina is also an italian drum'n'bass group.
5) Polina is a popular 80s and 90s Greek singer.
Biography text from Last.fm, available under CC BY-SA.