Bhagavad Gita: Chapter 1, Verse 13

ततः शङ्खाश्च भेर्यश्च पणवानकगोमुखाः ।
सहसैवाभ्यहन्यन्त स शब्दस्तुमुलोऽभवत् ॥ १-१३॥

tataḥ śaṅkhāś ca bheryaś ca paṇavānakagomukhāḥ
sahasaivābhyahanyanta sa śabdas tumulobhavat 1.13

Thereafter, the conch shells, drums, bugles, trumpets, and horns were all suddenly sounded, and the combined sound was overwhelming.