Pradyumna (leads chanting, etc.):
- tataḥ śaṅkhāś ca bheryaś ca
- paṇavānaka-gomukhāḥ
- sahasaivābhyahanyanta
- sa śabdas tumulo 'bhavat
- (BG 1.13)
Translation: "After that, the conchshells, bugles, trumpets, drums and horns were all of a sudden sounded, and the combined sound was tumultuous."
Prabhupāda: So there are mention of various types of musical instruments. Those instruments are no longer in use. But different types of bugles, drums, kettledrums, as they use in modern days. So the same principle. By musical instruments, the soldiers are kept alive so they can fight nicely. Sa śabdas tumulo 'bhavat: "When simultaneously all the instruments were sounded, it become tumultuous."