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Chromeo, Jagwar Ma and Royal Blood are amongst the latest acts to be added to Open'er festival's line-up.
The funk duo, Australian psychedelic band and Brighton rockers have been added to the Polish festival's bill alongside Danish electro-pop singer MO and DJ Maya Jane Coles.
The acts join previously announced artists Banks, Phoenix, Foals, Earl Sweatshirt, Metronomy, Warpaint, Pusha T, Tourist, Haim, Foster The People, Interpol, MGMT, Lykke Li, Julio Bashmore, Rudimental, Daughter, Ben Howard, Foster The People, Wild Beasts, Bastille and the Afghan Whigs.
Pearl Jam, The Black Keys and Jack White have already been confirmed as this year's headliners.
Open'er Festival takes place July 2 to July 5. Tickets are on sale now. For more information and tickets, visit Gigwise Tickets.