In 1659, Comenius produced a new edition of the 1618 Bohemian Brethren hymnal, "Kancionál, to jest kniha žalmů a písní duchovních" containing 606 texts and 406 tunes. In addition to revising the psalms and hymns, his revision greatly expanded the number of hymns and added a new introduction. This edition was reissued several times, into the nineteenth century. His texts in Czech were notable poetic compositions, but he used tunes from other sources. He also edited the German hymnal "Kirchen-, Haus- und Hertzens-Musica" (Amsterdam, 1661), which had been published under the title "Kirchengesänge" since 1566. In other writings, Comenius addresses both instrumental and vocal music in many places, although he dedicated no treatise to the topic. Sometimes he follows the medieval mathematical conception of music, but in other places he links music with grammar, rhetoric, and politics. Musical practice, both instrumental and vocal, played an important role in his system of education.