80:8 vine out of Egypt. The symbolic representation of Israel as a great vine planted by God is found in both Old and New Testaments. Note, for example, Isaiah 5:1-7; Jeremiah 2:21; Luke 20:9-18.
Psalm 81 (title) Gittith. See also the titles to Psalms 8 and 84. The name “Gittith” refers to the Philistine city of Gath. Its usage here could refer to some kind of musical instrument from that city.