Jeremy Montagu (1978). “One of Tut'ankhamūn's Trumpets”. The Journal of Egyptian Archaeology (Sage Publications, Ltd.) 64: 133–134. doi:10.2307/3856451. JSTOR3856451. https://www.jstor.org/stable/3856451. "a ceremonial instrument capable of producing only one or two notes. The lowest note is poor in quality and carrying power...the Egyptian military trumpet signal code was a rhythmic one on a single pitch..."
Jeremy Montagu (1978). “One of Tut'ankhamūn's Trumpets”. The Journal of Egyptian Archaeology (Sage Publications, Ltd.) 64: 133–134. doi:10.2307/3856451. JSTOR3856451. https://www.jstor.org/stable/3856451. "a ceremonial instrument capable of producing only one or two notes. The lowest note is poor in quality and carrying power...the Egyptian military trumpet signal code was a rhythmic one on a single pitch..."