This announcement appeared in the Church News in 1952. While I’m not familiar with any widespread habit of congregations routinely standing to sing hymns, it seems unlikely that such an announcement would be made unless this were, in fact, a known practice.
Congregation Remains Seated During Singing
Congregations should remain seated during the singing of hymns, it was recommended this week by the General Church Music Committee.
In making the announcement, Tracy Y. Cannon, chairman of the committee, said that in the new edition of the small handbook entitled, “General Recommendations Concerning Music in the Church,” the recommendation was being inserted as follows:
“To avoid undue confusion, during congregational singing it is recommended that the congregation remain seated. An exception to this might be when a congregational hymn is sung in the course of a long meeting where it is desirable that the people should arise in order to rest themselves.”
Sacrament meetings are worship meetings, the music committee pointed out, and everything in the proceedings should be eliminated which makes for disturbance or static.
The rising and sitting down of congregations with its attendant noise is not conducive for a reverent and quiet atmosphere in meetings.