I would approach him in a friendly way. First, find something positive about the music, whether it’s the musicianship, choice of music, etc. If the musicianship and music is not to your liking, then focus on the dedication that these musicians are giving, saying how much you appreciate them being there and giving of their time as most Catholic churches don’t pay or pay very little. I find when you start out with something positive before giving a constructive criticism or voicing a concern, it makes the conversation go more smoothly and won’t make the other person feel like he/she has to be on the defense. BUT always be sincere about it, which is why you have to find something you actually do like or appreciate.
After that, just speak with the pastor your concern with how much music is being used during the mass and how, even though you may either like the music or appreciate what is being done, sometimes a little silence in between is also good. You may or may not get the answer that you want or expecting, but at least you voiced your concern in such a way that you won’t be looked at as a “trouble-maker” or a “pain-in-the-rear”, which I’ve heard priests talk about regarding certain parishioners in private conversations with them.
Thank you for your thoughtful reply and suggestions.
Who knows, he might appreciate your comments and will pay more attention to the amount of music being done or the length of announcements being made at the next mass.