Singing a specific together with the congregation was a critical part of weekly lutheran religious services.

The answer is Chorale

Singing specific Chorale with a congregation as been a critical part of Lutheran religious services since centuries. 

Lutheranism itself is a major branch of the Protestant belief and is named after the leader of the movement, the German reformist Martin Luther.

The movement started in 1517 and is today a major branch of Christianity.

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