Fiona Talkington begins a week of recordings from Edinburgh's Across the North Sea festival with a session from two folk trios: Finnish band Varttina, and the improvisational Norwegian group Utia, which features percussionist and composer Terje Isungset. Plus tracks from a new album by Keith Jarrett and different versions of Charles Mingus 's tribute to Lester Young , Goodbye Pork Pie Hat.