Coenraad Walther Boer was a music teacher and conductor. He was not related to the architect Johannes Albertus Boer, who took part in the 1936 art competitions. Coenraad Walther studied at the Amsterdam Conservatory of Music. He became director of the Royal Military Band in 1920. In 1942 he fell into German captivity and was interned in the concentration camp Stanislau in Poland. There he kept up the morale of the inmates by supporting musical activities. After World War II, he again became director of the Royal Military Band.