Render “For the leading of the leaders in Israel (the princes), for the willingness of the people (to follow them) bless ye the Lord.” See Deuteronomy 32:42 note, and compare Judges 5:9 and Judges 5:13, where the nobles and the people are again contrasted.
Related Commentaries of Judges 5:2
Judges 5:2
2 Praise ye the LORD for the avenging of Israel, when the people willingly offered themselves.