I Chronicles 25:1 Moreover David and the captains of the host separated to the service of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with psalteries, and with cymbals: and the number of the workmen according to their service was:
David obviously had an order of service. He knew who was going to do what when. I also love it that they used music. It was planned. It was part of their worship.
Our church should be willing to always allow the Holy Spirit to change the order of service when He wants but as long as He doesn’t we should prayerfully be seeing how we can worship and use our time.