Both Old Testament command and New Testament example demonstrate that God desires that believers lift His praises together. He wants His children to gather for the purpose of honoring Him. This worship is still an individual, heartfelt response toward God, but it is expressed publicly in the presence of other believers. That brings God even more glory than if it were done privately.
For instance, a person receives more honor when he is praised in the presence of many people than if he were praised by one person privately. The great honor that comes with winning an Olympic gold medal is because thousands of people are watching the event. A solo violin can be beautiful, but when it is combined with other instruments in a symphony, the glory of the music is even more spectacular. The same is true when God is praised publicly in the presence of others. C. H. Spurgeon said, “Personal praise is sweet unto God, but congregational praise has a multiplicity of sweetnesses in it.”