ST. LOUIS – A British composer’s new choral anthem is a tribute to an unlikely honoree – a classical music critic in St. Louis battling a life-threatening disease. Sarah Bryan Miller, the critic for the St. Louis Post-Dispatch, received a private performance of composer Judith Bingham’s work in September. The public premiere will be Sunday by a consortium of music groups led by the St. Louis Chamber Chorus. Miller was diagnosed with cancer about a decade ago. What started as breast cancer has spread to her bones and liver. Doctors told her last summer “not to make plans” after Thanksgiving.