This document discusses notes from a workshop on music in the liturgy led by Rev. Fr. Leo Nilo Mangussad. It covers Church documents on sacred music like Musicam Sacram and GIRM that provide guidance. It discusses the purpose and guidelines for different parts of the Mass and the role of music in facilitating participation and proper expression of themes for each liturgical season or event. Instruments are permitted if suitable for sacred use and contribute to edification of the faithful.