The Shofar is one of the earliest musical instruments known to man.  It was developed by the early Hebrews and is made from the horn of an animal, usually a ram, but many times a goat, antelope, or gazelle.

Who Blows Shofars?
Does G-d?...Exodus 19:16-19
Do Priests?...Numbers 10:8

This book covers all the scriptures dealing with the blowing of the Shofar and also touches on when it is appropriate to blow the Shofar.  The book shows how G-d is using the Shofar in this day.  This teaching is done from a Christian perspective and is especially good for people that have never experienced the rich Jewish tradition of sounding the Shofar.  Only $9.99 plus postage.