פירוש על עבודה זרה 48:14

This is a midrash on the cows that sang on their way to Bet Shemesh, while accompanying the ark as the Philistines returned it to the Israelites. The word “vayisharnah” literally means went straight. But a similar root means to sing. So the rabbis take it to mean that the cows sang on their way to Bet Shemesh. [Definitely brings to mind some Sesame Street skits].