In Dietrich Bonhoeffer’s book Life Together there is a chapter called, "The Day Together." He makes some comments on singing that are worth repeating.
There are several elements hostile to unision singing, which in the community ought to be very vigorously weeded out. There is no place in the worship service where vanity and bad taste can assert themselves as in the singing. . . There is the solo voice that drowns everything else, bellowing and quavering at the top if its lungs, reveling in the glory of its own fine organ… Finally, there are often those who will not join the sining because they are particularly moody or nursing hurt feelings; and they disturb the community (Works, Vol 5, 67).
Everything minus Jesus equals nothing, but Jesus plus nothing equals everything.