The five hundred disciples of Pauṣyañji and Āvantya became known as the northern singers of the Sāma Veda, and in later times some of them also became known as eastern singers.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
उदीच्याः सामगाः शिष्या आसन् पञ्चशतानि वै । पौष्यञ्ज्यावन्त्ययोश्चापि तांश्च प्राच्यान् प्रचक्षते
udīcyāḥ sāmagāḥ śiṣyā āsan pañcaśatāni vai | pauṣyañjyāvantyayoścāpi tāṃśca prācyān pracakṣate
SB 12.6.78