Psalms 89:1

Ethan : a wise man, an Ezrahite, in Solomons time,son of Zerah son of Judah; the father of Azariah,son of Zimmah, of Gershom of Levi; ancestor of Asaph; the father of Adaiah,son of Kishi (Merari Levi); a worship leader in David's time
(31° 22´, 35° 4´); (31° 22´, 35° 4´)

Ezrahite : a descendant of Ezrah

Maskil : a literary or musical term

Psalms 56:1-13

David : a son of Jesse of Judah; king of Israel,son of Jesse of Judah; king of Israel

Gath : a town of the Anakim and Philistines in Judah 12 km south. of Ekron
(31° 41´, 34° 50´)

Miktam : a literary or musical term (NIV margin)

Philistines : a sea people coming from Crete in 1200BC to the coast of Canaan
(33° 33´, 35° 21´)

Psalms 98:1-9

Israel : a citizen of Israel.,a member of the nation of Israel