Chandogya Upanishad 1.6.8

1.6.8

tasyark ca sāma ca geṣṇau \
tasmād udgīthaḥ \
tasmāt tv eva udgātā \
etasya hi gātā \
sa eṣa ye cāmuṣmāt parāñco lokās teṣāṃ ceṣṭa devakāmānāṃ ca \
ity adhi(S ) \\106.8\

Ṛk and Sāman are his two jointsfootnote{Joints of the body, or songs.}. Thereforefootnote{He is 'ut' as well as 'gītha' (or song) for, Ṛk and Sāman are called 'geṣṇau' (songs).} he is Udgītha. Because the priest is the singer of this 'ut', he is the Udgātā. Moreover, he (this Person called 'ut') controls the worlds which are above that sun, as also the desires of the gods. This is with reference to the godsfootnote{The meditation of the Person in the Sun is finished. Next the meditation of the Person in the eye will be described.}.