Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
जगतु: सर्वभूतानां मन:श्रवणमङ्गलम् ।तौ कल्पयन्तौ युगत्स्वरमण्डलमूर्च्छितम् ॥ २३ ॥
ITRANS:
jagatuḥ sarva-bhūtānāṁmanaḥ-śravaṇa-maṅgalamtau kalpayantau yugapatsvara-maṇḍala-mūrcchitam
Translation:
Kṛṣṇa and Balarāma sang, producing the entire range of musical sounds simultaneously. Their singing brought happiness to the ears and minds of all living beings.