Charles H. Spurgeon on Psalms 150:3

Trumpet. Of natural horns and of instruments in the shape of horns the antiquity and general use are evinced by every extensive collection of antiquities...The Hebrew word shophar, rendered "trumpet", seems, first to denote horns of the straighter kind, including, probably, those of neat cattle, and all the instruments which were eventually made in imitation of and in improvement upon such horns. The name shophar means bright or clear, and the instrument may be conceived to have been so called from its clear and shrill sound, just as we call an instrument a "clarion", and speak of a musical tone as "brilliant" or" clear." In the service of God this shophar, or trumpet, was only employed in making announcements, and for calling the people together in the time of the holy solemnities, of war, of rebellion, or of any other great occasion. The strong sound of the instrument would have confounded a choir of singers, rather than have elevated their music. (John Kitto.) The shophar is especially interesting to us as being the only Hebrew instrument whose use on certain solemn occasions seems to be retained to this day. Engel, with his usual trustworthy research, has traced out and examined some of those in modern synagogues. Of those shown in our engraving, one is from the synagogue of Spanish and Portuguese Jews, Bevis Marks, and is, he says, one foot in length; the other is one used in the Great Synagogue, St. James's place, Aldgate, twenty-one inches in length. Both are made of horn. —James Stainer.