Ex. 32:18

18 Moses replied:
"It is not the sound of victory,
it is not the sound of defeat;
it is the sound of singing that I hear."

As the children of Israel waited for Moses to come down from the mountaintop, they collaborated with Aaron to make a golden calf as an idol. Next thing you know, they are worshiping it and claiming that the calf was the source of their deliverance!

God alerts Moses to the blasphemy going on below, and when Joshua misinterprets the noise of the people as that of war, moses responds in the verse that you see above.

The Hebrew word for "sing" is anah and can be translated as confusing noise or the sound of busy-ness.