Manasara 58.4

58.4

devasyānucaraiḥ yakṣā vidyādharāśca pāragāḥ
gānayogyā gandharvā devāṅgulyāmanārthakam

Yakṣas are followers of the gods, and Vidyādharas are fully accomplished; / Gandharvas are suited for singing, [fashioned according to the rule of] the gods' finger-measure;