…My concern is should they ask me to play after becoming a member & how I would respond. I’m kind of on the fence with the gutiar music at mass; my style would accompany everything fine. However; it really isn’t necessary…
You *could *let someone else be the judge of whether or not you are necessary and then play it by ear (so to speak) concerning whether you feel you are doing the right thing as time goes on. If you are asked, you can just say, “Sure, as long as I think it is appropriate as sacred music, I would be happy to help you out sometimes.” (or I’d be happy to join the music ministry …or whatever it is you’d be willing to do).
In Sacrosanctum Concilium, the Church’s Constitution on Divine Liturgy, Chapter VI is devoted to sacred music. You might want to read it yourself, and then you’d have a better idea what the mind of the Church is on this matter. The guitar is certainly not forbidden.
vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_const_19631204_sacrosanctum-concilium_en.html
*"In the Latin Church the pipe organ is to be held in high esteem, for it is the traditional musical instrument which adds a wonderful splendor to the Church’s ceremonies and powerfully lifts up man’s mind to God and to higher things.
But other instruments also may be admitted for use in divine worship, with the knowledge and consent of the competent territorial authority, as laid down in Art. 22, 52, 37, and 40. This may be done, however, only on condition that the instruments are suitable, or can be made suitable, for sacred use, accord with the dignity of the temple, and truly contribute to the edification of the faithful."*
You could also read Musicam Sacram, the Instruction on Music in the Liturgy
vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_instr_19670305_musicam-sacram_en.html
It is highly desirable that organists and other musicians should not only possess the skill to play properly the instrument entrusted to them: they should also enter into and be thoroughly aware of the spirit of the liturgy, so that even when playing ex tempore, they will enrich the sacred celebration according to the true nature of each of its parts, and encourage the participation of the faithful.
There are few parishes with so many musicians who have reached a professional level of skill that they are in a position to exclude any who play a suitable non-organ instrument in a manner suitable for a sacred setting. The sort of guitar music you are describing is *not at all *what most people are thinking of when they think “guitars in church.” They are thinking of folk guitar, and folk guitar played exclusively by rhythmic strumming. (You know the kind I mean.) Many do not even dream that somebody might volunteer who can use a guitar to play Bach. There is no reason to believe the guitar music you would agree to play is not suitable for a sacred setting, every bit as suitable as a piano, even if the guitar does not have the pride of place that the organ does.