It worries me that your pastor would be so ignorant or disobedient of Church documents which clearly state things such as the Church’s preference for type of music, selection of music pieces, and instruments to be used, as well as music and instruments that are forbidden. It makes me wonder what other abuses are present in your parish. The pastor is the true liturgist, and as such, he should be aware of the Church documents. As a priest, he should also be aware of not only liturgical documents but conciliar and papal documents on the faith. These writings comprise the very Tradition to which Catholics adhere to, in an unbroken line from Holy Scripture to the present day. I would suggest that if you are determined to stay in this parish, that you look around you in the pews, and find parishioners who feel the same way as you, and equip yourselves with the relevant Church documents which explain the exact options for music in liturgy, and present them to your pastor. It would also help if you and others like you are available for ministry, or for donations. You could offer to purchase traditional hymnals or start a fund-raiser for organ installation or repairs. Or you could offer your own voice for the choir, and insist that the music be reverent and fitting for the Holy Sacrifice of the Mass.
For examples, you may look to your diocesan cathedral to see how things are done there, under the watchful eye of your bishop. Are things changing for the better? Is your bishop doing all he can to encourage the retention of Latin, the singing of the Ordinary, chanted Propers, and sacred instruments such as the pipe organ? Other parishes might be chosen as pilot projects for this activity as well. How are they received in your diocese? Are they maligned and avoided by Catholics, or have they become a magnet for people who appreciate liturgy properly done?
It is helpful if you judge the climate around you before you act. You will know beforehand what kind of chance you have at succeeding. I hope that you can stay in your parish, as it is vastly preferable to stay and fix things from within, rather than parishioners who leave for greener pastures.