NO folk musicians have broadened their horizons, and the possibilities for that traditional form of English music, more than The Unthanks in their ten years together.

Winning the Album of the Year category at the 2016 BBC2 Radio Folk Awards with last year's Mount The Air was the perfect start to their second decade, heralding the promise of more beauteous music-making to come, so full of soul and heart and moon-lit magic.

Right now, sisters Rachel and Becky Unthank have gathered their best ever line-up of accompanying players under the musical directorship of Rachel's husband, the pianist, composer, producer and arranger Adrian McNally. The voices may be the core, each as gorgeous as the other, yet even more divine together, but it is McNally's alchemy that is taking The Unthanks to new heights.

Increasingly, he is steering the musicians into jazz instrumentation, but still rooted in folk's more direct route to the heart, yet with thrilling room for something more expansive, more surprising, and even more beautiful, with none of jazz's show-off indulgences. Fellow North Easterners Lanterns On The Lake, albeit in an electric rather than acoustic setting, are venturing this way too.

Tradition still has its place in The Unthanks, especially when Rachel and Becky don their dancing shoes, but the union of piano, fiddles, viola, cello, trumpet, accordion and more besides fair take the breath away, topped off by singing that can make you so sad, so happy, so full of wonderment.