His publications include the chapter on German church music in the 18th century ` The New Oxford History of Music , to many harmony textbooks for music students as well as books entitled Bach 's Passions , Bach for Choirs , and Performing Bach 's Vocal Music .
He wrote a chapter on 18th century German church music in The New Oxford History of Music , he wrote several books to show students how to write harmony , and books on how to perform Bach 's music called Bach 's Passions , Bach for Choirs , and Performing Bach 's Vocal Music .