Polish festival that draws the world's biggest names in music and fans from all over the globe.
Animal Collective and Tame Impala have been added to the line up of this year's Open'er Festival in Poland.
It will be Tame Impala's first gig in the country.
Heineken Open'er takes place July 3-6 2013 at on old airbase in Gdynia.
Blur, Arctic Monkeys, Queens of the Stone Age and Kings of Leon have all already been confirmed for this year.