Nārada wanders the worlds with his vīṇā, carrying news between gods and people. In Kṛṣṇa’s list of himself, among the celestial seers, he names Nārada.
Going deeper
10.26 is a single line of Kṛṣṇa's list in chapter 10: of trees he is the Aśvattha, of celestial seers he is Nārada, of the Gandharvas Citraratha, and of the perfected, Kapila. The verse before, 10.25, names Bhṛgu among the great seers, the single syllable Om among words, the sacrifice of japa, and the Himalayas among things that do not move. The verse after, 10.27, moves to horses, elephants and men. In each pair the Gītā picks one name as the best of its kind, and for the celestial seers that name is Nārada. The story describes him as the wanderer with the vīṇā who carries news between the worlds. He is named once more in the same chapter, at 10.13, where Arjuna says the seers all declare this of Kṛṣṇa, among them Nārada, Asita, Devala and Vyāsa. Read it in chapter 10, and what the Gītā says about devotion collects related verses.