"If we just (implement x kind of music), we'll (get result y)."
Though it seems most often applied to the x and y "do praise and worship music" and "get young people in church", it really can apply across a wide array of musical styles, each of which has an audience, so to speak.
"Big classical choral music"? "People with money." (The public radio approach, you might say.)
"Good ol' gospel music"? "Real faithful Christian folk." (Judgmental much?)
You get the idea, and you can probably fill in the blanks yourself, no matter how broad or limited your musical experience. Whenever churches go looking for a magic elixir to "revitalize" or boost their numbers, music in worship seems to be a really popular place to start.
And on some level, it can work. A newly-instituted contemporary worship service can draw in some of the curious. A big fancy choir can get some onlookers. I don't know of any church that has decided to go whole hog on the gospel song approach out of the blue, but they might just poach a few old-timers from some churches if they did.
So yes, as the title of this article wants to suggest, contemporary Christian music (or gospel song or "traditional" hymnody, whatever that means) probably is bringing Christians together.
It (whichever style you name) is also driving Christians apart.
Note that I have not read and am not at all referring to the content of the article (I assume I'll get around to reading it eventually, but I'm pretty sure it won't be before Easter Sunday). Since the article is in Christianity Today I can safely that their audience is not my audience, or at least my target audience. But the title itself, as a new iteration of this familiar old refrain, is enough to provoke comment.
And that comment is one rooted in nothing more complicated than human nature. Some will glom onto the contemporary thing, others will run from it as fast as possible. And you can go down the line through whatever variety of congregational song you please, and you can get the same result.
There is reference here to a hoary old trope of music as somehow a great unifier. That itself is probably some variant of the even hoarier old trope of music as a "universal language." Do yourself a favor and spend some time with a broader variety of musics from around the world before ever uttering that line, please? For that matter, spend some time with, say, Hildegard of Bingen and Anton Webern and see if that "universal language" idea still makes sense to you. Folks who try to talk the "universal language" thing are probably not widely familiar with a lot of things, or are mostly interested in pushing a highly Westernized version of those musics (this happens a lot in popular music, in which Western - read 'American' - influence is almost impossible to escape).
One could argue that the same thing has been true in what might be called the "global song of the church" as well. Those in various "mission fields" were largely fed translated versions of American or European hymns as the stuff of their worship. It took quite a while to get away from that tendency and to see the growth of more indigenous musical expressions of faith and gospel begin to grow. Even so, any degree to which the "brings people together" argument for global church song might hold water is going to be largely a colonialist legacy as much as anything Christian.
The same is going to be true across other styles as well. The contemporary Christian impulse has a huge component of stylistic export involved, with the style being extremely American even if its biggest producers come out of Australia.
Disturbing colonialist legacies aside, it really never is the music itself that "brings people together." Music is not magic, as the title here suggests. The uniting or dividing is done by people, just as pretty much everything that happens in or to the church, for good or ill, is done by people. If some number of people choose to come to a church because of its musical performance style (and some number in turn choose to leave or stay away), it's the people doing the moving and choosing.
It would be far more accurate to say that in choosing a particular musical idiom for your congregation, you're also choosing a potential "target demographic" that you hope to bring in. If you end up drawing more baby boomers or GenXers than millennials with your contemporary service, which could easily happen, that's another issue, but the choice to plant one's flag in a particular musical category is also a choice about who you want in your church. Frankly, it should be openly acknowledged as such. You'll get exceptions to the rule for sure, but be clear about exactly what you're seeking with your church's musical choices.
This frankly is not even about declaring such choices right or wrong. You do you, dear pastor. But be honest with yourself about exactly what you're trying to do when you make one musical choice or another, and don't expect music to be a magic elixir that brings the entire world (no exceptions) under your roof.
But what about the people who didn't go to the concert?