Bernier's most important musical treatise was the "Principles of Composition of/by Bernier". He was not concerned so much with harmonic inversions or questioning; rather, he emphasized methods and the importance of the horizontal lines with the foundation of the vertical line structured upon the relationship of the two. Bernier was considered to be an excellent teacher and the appointment at Chartres is indicative of his organ playing abilities. Compositional output was both sacred and secular in the respective genres of motets and masses, and cantatas. ~ Keith Johnson, Rovi