The Bhagavad Gita with Commentaries of Ramanuja, Madhva, Shankara and Others.
Bhagavad Gita 1.13
http://www.bhagavad-gita.us/articles/647/1/Bhagavad-Gita-113/Page1.html
By Bhagavan Sri Krishna
 

Text 13

tatah sankhas ca bheryas ca
panavanaka-gomukhah
sahasaivabhyahanyanta
sa shabdas tumulo ’bhavat

Translation

After that, the conchshells, drums, bugles, trumpets and horns were all suddenly sounded, and the combined sound was tumultuous.

Commentary by Srila Prabhupada

No commentary by Srila Prabhupada.

Commentary by Sri Visvanatha Cakravarti Thakur

When Bhisma blew his conch, at that time, in his army suddenly instruments and conches began to sound. Abhyahanyanta is a reflexive passive. Panava, anaka, and gomukha are types of instruments. The sound was very great as they sounded all at once.