There are (at least) five artists using this name:

1) Polina is a Russian singer/songwriter.

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. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.