In this way, Śrī Kṛṣṇa, along with His elder brother Balarāma, passed the childhood age known as kaumāra and stepped into the age of paugaṇḍa, from the sixth year up to the tenth. At that time, all the cowherd men conferred and agreed to give those boys who had passed their fifth year charge of the cows in the pasturing ground. Given charge of the cows, Kṛṣṇa and Balarāma traversed Vṛndāvana, purifying the land with Their footprints. Chapter 15, Killing of Dhenukasura
Krishna Lilas - The Nectarian Pastimes of the Sweet Lord
When one day Krishna woke first from a rest in the forest with his cowherd friends, he decided to wake everyone and call the cows grazing at a distance by playing his flute. When Krishna blew the nectar of his lips into the flute, a melodious raga with a slow rhythm and a deep base emerged from its end. This wonderful vibration enchanted the peacocks in and around the Govardhan hills. Their hearts began to sing in happiness and fill the skies with their own song.