Here is Niceta of Remesiana (On the Benefit of Psalmody, 4th century C.E.) after discussing church music at length (joyful noise, yada yada yada). He ends this way:
Those, however, who are not able to blend and adapt themselves to the others, ought better to sing in a subdued voice than to create a great clamor; and thus they fulfill their liturgical obligation and avoid disrupting the singing community. For it is not given to all to possess a supple and pleasant voice.
So, who should and should not sing (or perform musically) in church? What about congregational singing? And remember, in your comments please try not to offend the singing community.