What about the music?

I don't know for certain, but I'm betting that music is one of the most hotly contested parts of worship in today's churches.
What to use.
What not to use.
How to use it.
What's Spirit-filled?
What's "too much like the world"?
There are godly people on both sides of the equation.

All across America, and some other countries, too (at least the ones that still allow churches and gatherings), we can find a wide variety of worship music. Some churches will not utilize any instruments at all; they only use the human voice to praise Him. Some will use a piano and an organ, but frown on the use of recorded accompaniment or sound "tracks." Other churches will have a mini-orchestra playing during the worship time, and still others have praise "bands" that rival those at a concert.
Are there "right" and "wrong" ways here?
I believe so, and I will explain . . .
Many churches today are allowing music to be used in their services that is not glorifying to God, and even has unsound doctrine in it. Music is a powerful medium, and can effect the body, mind, and emotions.  You know the term, "ear worm"? It's referring to the fact that music often stays with a person -- songs roam around in our heads after we hear them. We are remembering snippets, phrases, and words as the song repeats in our minds and on our lips. Music is an extremely effective teacher!

That brings me to our first point: the lyrics of worship music are vitally important. If we would not allow just any book to be used in our Bible studies, then why would we gloss over the lyrics of our worship songs? They must have lyrics that glorify God, remind us of His character, tell of His sacrifice, or exhort us to be more like Him.  There are a few old hymns that contain some incorrect theology; I've heard some hard-driving music that presents the death and sacrifice of Christ in absolutely correct doctrine. It's a matter of style.

What about the instruments? Now we are getting to the question of "style." I don't believe that instruments are good or evil in and of themselves. It's the motive and the intent in choosing/using particular instruments that gives us pause. Instruments can create a mood, a message, or an atmosphere, but that comes from the musician who is utilizing them.
Musical instruments have been around since before the flood. They can all be used to glorify God, or to glorify someone (or some thing) else. Some people are very well-intentioned, but very legalistic, too. They will say, for example, that they don't see the drums used in the Bible, so it must be wrong to use the drums in church worship.  If we study the definitions, though, we will see that the timbrel mentioned in scripture was a percussion instrument that could be played with the hands or with sticks. There are many verses that talk about some pretty noisy instruments being used in worship: horns, cymbals, and more! Apparently, it's not the decibel level but the motivation and intent of the player that counts!

Another observation of mine (see, I'm warning you this is my opinion) is that some worship and praise music appeals more to the flesh than to the Spirit-filled believer. The problems come when the songs don't focus on Christ and have little or no beneficial lyric content. I'm concerned that much of it is way too repetitive, and the singers even begin to focus inwardly and end up in a trance-like state. If we are not entranced, we are at best singing words that are pretty shallow in theology - and some even have false doctrines.
I believe we need to examine the songs we listen to and sing along with; are they focused on Christ, or on a feel-good personal focus? Are they sound theologically? Do they glorify God?
Let's look at a couple of examples . . .

“Great is Thy faithfulness,” O God my Father, There is no shadow of turning with Thee; Thou changest not, Thy compassions, they fail not As Thou hast been Thou forever wilt be.

This grand old hymn tells us that God is faithful; He is unchanging; He is compassionate; He will always be. Sound theology here.

Great is the Lord, He is holy and just, by His power we trust in His love. Great is the Lord, He is faithful and true, by His mercy He proves He is love. Great is the Lord and worthy of glory, great is the Lord and worthy of praise. Great is the Lord, I lift up my voice, I lift up my voice, great is the Lord, great is the Lord. (Rita Baloche, Maranatha Music)

This worship song tells us truths: God is indeed holy, just, powerful, faithful, and loving.
Another song that comes to mind is a more recent one, called "This I believe - the Creed" by Hillsong and by the Newsboys. It's a powerful reminder of many of the faith doctrines we hold dear, and also a reminder that Christ will return.
I'd rather not post examples of unsound doctrinal songs, since the internet is a very powerful thing. The more you post something, the more power it has! But I think you see my point.

One last thing to consider is the person, or choir, or instrumental group who is presenting a worship song or worship music. Are they praising God? Is their focus on Him? Or, and this is a fine line, are they "performing" for those who listen. I truly believe that we can know the difference from the singing, the body language, and from the testimony of the singer. If they are keeping their eyes on Christ, and honoring Him, they are truly praising Him from the heart.

Music is truly a gift from God. His people sing! Even if we have a choir or choral group or soloists, corporate worship (congregational singing) should be the primary means of praise in our worship services. Church worship music should be about praise of our God, and edification of the believers.

Let all who have breath and life praise the Lord!