Each week Celtic Songlines takes a musical journey through the Celtic lands. This week's program features Robin Bullock & Steve Baughmann; Iona: America's  pan-Celtic band, featuring three wonderful selections from its album Silver;  Scotland's cherished vocalist Julie Fowlis; the band Flook; piper John McSherry; the Afro-Celt Song System; and (new on our playlist) singer and writer Amelia Coburn, pictured here.