तस्यर्क्च साम च गेष्णौ तस्मादुद्गीथस्तस्मात्त्वेवोद्गातैतस्य हि गाता स एष ये चामुष्मात्पराञ्चो लोकास्तेषां चेष्टे देवकामानां चेत्यधिदैवतम् ॥ १.६.८ ॥
In plain words
The Ṛc and the Sāman are his two songs; therefore he is the Udgītha, and therefore the singer of it is the Udgātṛ, for he is the singer of him. He rules over those worlds that are beyond that sun, and over the desires of the gods. So much with respect to the gods.