Dr. Ben Whitworth, the liturgical musician and learned English writer who is the Assistant Editor of Usus Antiquior, has written a most useful book, Music in the Liturgy.
Written for the non-expert lay Catholic, and focused on the Ordinary Form of the Mass, the book provides an introduction to liturgical music in a low-cost, accessible format. It is simple, yet evocative, leading the reader to ponder aesthetics in general, the theology and ecclesial practice of singing, and, most especially, the key role that music is intended to fulfill in the liturgy.
One can easily see the benefits of providing copies of Music in the Liturgy to choir members, parishioners, and particularly those involved in making parish decisions that affect the music program.