Shiva Purana
गन्धर्वोरगयक्षाणां सुमानियः शुभस्वराः ॥ गायन्त्यो मंगलं गीतन्तत्राजग्मुरनेकशः॥ १३॥
They are the most respected and auspicious voices of the gandharvas, serpents and yakshas. They came there in great numbers singing auspicious songs.
english translation
gandharvoragayakSANAM sumAniyaH zubhasvarAH ॥ gAyantyo maMgalaM gItantatrAjagmuranekazaH॥ 13॥
hk transliteration by Sanscript