We will reign over the new earth, the universe. We will minister to the Lord God our Father, and to the Lord God our Brother. One way to do this, submitted here as a thought-starter, is through music. We know Jesus sang psalms. We even know he breaks out in song for joy when his millennial kingdom is established.
Music is one service.
Imagine dance as well. And the written word. And the spoken word. And electricity in the air. The heavenly new Jerusalem.