Stentor is a distributer of orchestral stringed instruments, sold under their Stentor Brand. They also distribute guitars and other stringed instruments under the Ozark brand, a full range of musical instrument accessories and own the Touchstone Tonewoods business.
The Stentor logo - a shouting Trojan - depicts the Trojan Stentor reknowned for his loud voice. From Homer's Illiad:
[His] voice was as powerful as fifty voices of other men.
He died after his defeat by Hermes in a shouting contest.