Plant will headline the festival's main stage on Saturday 18 August

Plant will appear with his band Strange Sensation at the mid-Wales festival, which takes place on 17 and 18 August.

Newsom, whose album Ys has been critically acclaimed, will be making her third appearance at the event.

Founded in 2003, the festival has featured Jose Gonzalez, Donovan and the Incredible String Band in recent years.