Dr. Anton E. Armstrong, conductor of the acclaimed St. Olaf Choir, will write the foreword for Brothers, Sing On! Conducting the Tenor-Bass Choir, due out in spring 2013. Armstrong’s association with all-male choral singing dates back more than 20 years. In addition to his work at St. Olaf, he serves on the summer faculty for the American Boychoir and is conductor of the Troubadours, a boys’ youth ensemble in Northfield, MN.