Plot: Ryan Bancroft joins BBC NOW as principal conductor at BBC Hoddinott Hall in Cardiff Bay for his first official engagement, his Proms debut and the first Prom from Wales! Martinu’s quirky Jazz Suite complements John Adams’s Chamber Symphony, written in 1992. After the world premiere of a new BBC commission by British composer Gavin Higgins, there are two evocative American classics by Barber and Copland