The Bible tells us that “the trumpeters [who were all priests] and the singers were as one in causing one sound to be heard in praising and thanking Jehovah,... ‘ for he is good, for to time indefinite is his loving - kindness. ’ ”
נאמר במקרא: ” ויהי כאחד למחצרים [שהיו כוהנים] ולמשוררים להשמיע קול אחד להלל ולהודות ליהוה,...