This from Jeffrey Tucker at Musica Sacra. This is an actual insight by none other than Francis Cardinal Arinze, in an interview with Inside the Vatican.
Here's a quote from the good Cardinal on guitar:
"I will not now pronounce and say never guitar. That would be rather severe. But much of guitar music may not be suitable at all for the Mass. Yet, it is possible to think of some guitar music that would be suitable, not as the ordinary one we get every time, the visit of a special group, etc."
Of course, that "ordinary one we get every time" is referring to the pop and folk and even rock styles of guitar used.
Here's the affirmation:
"But not individuals just composing anything and singing it in church. This is not right at all."
Still awaiting the results of a good crackdown from Rome, I remain peacefully,