This also applies to the ministry of preaching. The principle of progressive solemnity recognizes that there are degrees of solemnity in liturgical celebration. This pertains to the participation of ministers, the use of ritual movement, the selection of optional rites, and music. Its implementation offers the possibility of a rich and pleasing variety in the Sunday celebration. Liturgical Aids Parishes should provide satisfactory musical aids to assist the assembly in full participation.
Provision needs to be made for a variety of musical styles.
As far as possible, music aids need to provide not only musical text but also musical notation. A worthy parish hymnal is recommended. Though Missalettes with scripture and prayer texts printed in them may be intended to facilitate communal liturgical prayer, they can lead to a privatized experience of liturgy which often negates true liturgical participation. Minimalism in ritual and an unyielding concern for practicality thwart the liturgy's fruitfulness. Primary symbols of the liturgy, i.e., the assembly, the architectural focal points of altar, ambo, and chair, and the elements of bread and wine should appear primary.