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…Kṛṣṇa was very expert in playing the flute, and the gopīs were captivated by the sound vibration, which was not only attractive to them, but to all living creatures who heard it. One of the gopīs told her friends, ”The highest perfection of the eyes is to see Kṛṣṇa and Balarāma entering the forest and playing Their flutes and tending the cows with Their friends.“
Persons who are constantly engaged in the transcendental meditation of seeing Kṛṣṇa, internally and externally, by thinking of Him playing the flute and entering the Vṛndāvana forest, have really attained the perfection of samādhi.
Kṛṣṇa, the Supreme Personality of Godhead
By His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Chapter 21
The Gopīs Attracted by the Flute
Kṛṣṇa was very pleased with the atmosphere of the forest where flowers bloomed and bees and drones hummed very jubilantly. While the birds, trees and branches were all looking very happy, Kṛṣṇa, tending the cows, accompanied by Śrī Balarāma and the cowherd boys, began to vibrate His transcendental flute. After hearing the vibration of the flute of Kṛṣṇa, the gopīs in Vṛndāvana remembered Him and began to talk amongst themselves about how nicely Kṛṣṇa was playing His flute. When the gopīs were describing the sweet vibration of Kṛṣṇa’s flute, they also remembered their pastimes with Him; thus their minds became disturbed, and they were unable to describe completely the beautiful vibrations. While discussing the transcendental vibration, they remembered also how Kṛṣṇa dressed, decorated with a peacock feather on His head, just like a dancing actor, and with blue flowers pushed over His ear. His garment glowed yellow-gold, and He was garlanded with a vaijayantī necklace. Dressed in such an attractive way, Kṛṣṇa filled up the holes of His flute with the nectar emanating from His lips. So they remembered Him, entering the forest of Vṛndāvana, which is always glorified by the footprints of Kṛṣṇa and His companions.
The Hare Krishna Movement 