R. Meir says: Even fetuses in their mothers' wombs opened their mouths and chanted song before the L–rd, viz. (Psalms 68:27) "In assemblies bless G–d — the L–rd, from the source of Israel." And not Israel alone chanted song before the L–rd, but also the ministering angels, as it is written (Ibid. 8:2) "How mighty is Your name in all the earth — (You) who have spread Your splendor on the heavens!"