注維摩詰經 1.218

1.218

什曰：天樂神也。處地上寶山中，天欲作樂時，此神體上有相出，然後上天也。肇曰：天樂神也。居地上寶山中，天須樂時，此神體上有異相現，然後上天也。

[Kumāra]jīva says: Celestial music spirits. They dwell in the jewel mountains on earth; when the devas wish to make music, signs appear on the bodies of these spirits, and then they ascend to heaven.
[Seng]zhao says: Celestial music spirits. They dwell in the jewel mountains on earth; when the devas need music, rare signs appear on the bodies of these spirits, and then they ascend to heaven.