SB 6.12.34
tada ca khe dundubhayo vinedur
gandharva-siddhah samaharsi-sanghah
vartra-ghna-lingais tam abhistuvana
mantrair muda kusumair abhyavarsan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When Vrtrasura was killed, the Gandharvas and Siddhas in the heavenly planets beat kettledrums in jubilation. With Vedic hymns they celebrated the prowess of Indra, the killer of Vrtrasura, praising Indra and showering flowers upon him with great pleasure.