John Wesley introduced congregational singing to the English-speaking church.
He published the following “Directions for Singing” in his “Sacred Melody” book of hymns:
Learn these tunes before you learn any others; afterwards learn as many as you please.
Sing them as they are printed here, without altering or mending them at all; and if you have learned to sing them otherwise, unlearn it as soon as you can.
Sing all. See that you join with the congregation as frequently as you can. Let not a slight degree of weakness or weariness hinder you. If it is a cross to you, take it up, and you will find it a blessing.
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 sang the songs of Satan.