Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 2

Sanskrit:

कुसुमितवनराजिशुष्मिभृङ्ग-द्विजकुलघुष्टसर:सरिन्महीध्रम् ।मधुपतिरवगाह्य चारयन् गा:सहपशुपालबलश्चुकूज वेणुम् ॥ २ ॥

ITRANS:

kusumita-vanarāji-śuṣmi-bhṛṅgadvija-kula-ghuṣṭa-saraḥ-sarin-mahīdhrammadhupatir avagāhya cārayan gāḥsaha-paśu-pāla-balaś cukūja veṇum

Translation:

The lakes, rivers and hills of Vṛndāvana resounded with the sounds of maddened bees and flocks of birds moving about the flowering trees. In the company of the cowherd boys and Balarāma, Madhupati [Śrī Kṛṣṇa] entered that forest, and while herding the cows He began to vibrate His flute.

Purport:

As suggested by the words cukūja veṇum, Lord Kṛṣṇa skillfully blended the sound of His flute with the lovely sounds of Vṛndāvana’s multicolored birds. Thus an irresistible, heavenly vibration was created.