Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 3
कस्मिन् युगे प्रवृत्तेयं स्थाने वा केन हेतुना ।कुत: सञ्चोदित: कृष्ण: कृतवान् संहितां मुनि: ॥ ३ ॥
kasmin yuge pravṛtteyaṁsthāne vā kena hetunākutaḥ sañcoditaḥ kṛṣṇaḥkṛtavān saṁhitāṁ muniḥ
In what period and at what place was this first begun, and why was this taken up? From where did Kṛṣṇa-dvaipāyana Vyāsa, the great sage, get the inspiration to compile this literature?
Because Śrīmad-Bhāgavatam is the special contribution of Śrīla Vyāsadeva, there are so many inquiries by the learned Śaunaka Muni. It was known to them that Śrīla Vyāsadeva had already explained the text of the Vedas in various ways up to the Mahābhārata for the understanding of less intelligent women, śūdras and fallen members of the family of twice-born men. Śrīmad-Bhāgavatam is transcendental to all of them because it has nothing to do with anything mundane. So the inquiries are very intelligent and relevant.