Sing lustily and with good courage. Beware of singing as if you were half dead, or half asleep; but lift up your voice with strength. Be no more afraid of your voice now, nor more ashamed of its being heard, than when you sung the songs of Satan.For similar reasons, Martin Luther used to call his whole congregation together midweek so that they could learn new hymns and practice their singing for Sunday. But, of course, Sunday itself is also practice—practice for heaven, a rehearsal for the resurrection life of the world to come.
(Excerpted from this post at Matthias Media. Emphases added.)