At what point does a parochial vicar have say in what goes on during the Masses that he celebrates? Do the authoritative documents offer him any relief? For example, if the choir does not show up, can he ask someone to lead the singing (provided that they are competent in sacred music)? Can he also use his own general intentions (which follow the Church's traditional format) as opposed to those published by OCP?
The multiple-choice options in the Mass are completely at the celebrant's discretion: the choice of the penitential rite options, the eucharistic prayer options, the memorial acclamation, etc.
The format of the general intercessions is very little specified in the Missal, and what OCP provides is only a suggestion.
On the other hand, the pastor has authority to give directives to the musicians and the congregation; so if the pastor were to object to certain pieces or styles of music, or certain performers, that would have to be respected.
Yes, it would depend on the Pastor and how much he wants to influence what goes on during the parochial vicar's Masses.
Also, parochial vicars should always respect the wishes of their pastor and not push too much until they become Pastor... less they be reassigned to the middle of nowhere or worse. My advice to them would be to do whatever they are asked to do in the most reverent and respectful way they can and to be very friendly and smile at parish functions.
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