I understand that as soon as Rutherford kicked-the-bucket, they all started singing again. JW's did not agree with Rutherford's interpretation.
On 9th August 1944 at the Convention in Buffalo, F W Franz released a new song book "Kingdom Service Song Book" available at 10c per copy. New song released "Take Sides With Jehovah" which many on here will remember. There was a a talk leading up to this showing why JW's should be singing. WT September 15, 1944 P285.
George