The Oxford Book of Easy Flexible Anthems: Simple, varied anthems for the church year. Paperback. Edited by Alan Bullard. Caters for church choirs of all types and sizes, enabling them to have at their fingertips easy music for every occasion. The collection presents flexibility of scoring in a constructive and realistic way, with particular provision for unison or two-part singing, while not forgetting SATB choirs, and a focus on ease of learning and performance.