During the course of the Remembrance meeting in the Plymouth Brethren tradition, men in the congregation will rise individually to call out a hymn, lead in prayer, read from the Scriptures, offer worshipful praise and thanksgiving, or any combination of those, all of it centered on the Lord Jesus Christ. Usually, the meeting opens with a hymn and, sometime during the latter half of the hour (or so), the bread is eaten before the cup is passed. There may be many or few periods of silence, sometimes lasting two or three minutes.
There no script, no particular order, little regard for the clock, and no person or team leads the meeting.
I was never more discouraged in my faith until I worked for a church and was enlightened to the fact that the preacher didn't come up with his own sermon by prayer and meditation - instead, as he told me, his sermons came from someone else (the name I don't recall) who earns their living scheduling out the calendar with topics to preach about for that particular denomination. This pastor explained to me that that is the way it is done in all denominations as set up by the national organizations (I can't put it the way he did, but something like Southern Baptists use John Doe's schedule, United Methodist use Jane Doe's schedule, and so on.) I don't know how true it was, but I did see for myself his schedule and I was NOT impressed at all.
I didn't stay at that job but for a week. I prefer the church where sermons come from God, and services are very much like the Plymouth Brethren tradition.
As to the instruments in church - there are many, MANY people who have been blessed with a supernatural ability to play instruments who play them ONLY in praise, worship and thankgiving to Jesus. Doesn't the Bible say we are to give thanks to God for every blessing?