Poland's biggest summer shindig, the Heineken Open'er Festival, has added a trio of top acts to its roster.

The Strokes, Crystal Fighters and James Blake have been confirmed by the festival organisers, joining previously announced guests Pulp and Coldplay.

Now in it's tenth incarnation, the Heineken Open'er draws music fans from many shores. Last year it was recognised at the European Festival Awards as the Best Major Festival of 2010.

The four-day extravaganza, beginning this year on 30 June, takes place at Gdynia, on the Baltic coast.

Other guests due to strut their stuff this summer include Cut Copy, The National, Deadmau5, Kate Nash and Foals. (nh)