Psalms 42:1

Korah : a man who led a rebellion against Moses and Aaron.,son of Esau and Oholibamah,son of Eliphaz son of Esau,son of Izhar son of Kohath son of Levi,son of Hebron of Judah,son of Izhar (Amminadab) son of Kohath son of Levi

Maskil : a literary or musical term

Psalms 44:1

Korah : a man who led a rebellion against Moses and Aaron.,son of Esau and Oholibamah,son of Eliphaz son of Esau,son of Izhar son of Kohath son of Levi,son of Hebron of Judah,son of Izhar (Amminadab) son of Kohath son of Levi

Maskil : a literary or musical term

Psalms 46:1

Alameth : a kind of song
(31° 49´, 35° 17´)

Korah : a man who led a rebellion against Moses and Aaron.,son of Esau and Oholibamah,son of Eliphaz son of Esau,son of Izhar son of Kohath son of Levi,son of Hebron of Judah,son of Izhar (Amminadab) son of Kohath son of Levi

Psalms 88:1

Ezrahite : a descendant of Ezrah

Korah : a man who led a rebellion against Moses and Aaron.,son of Esau and Oholibamah,son of Eliphaz son of Esau,son of Izhar son of Kohath son of Levi,son of Hebron of Judah,son of Izhar (Amminadab) son of Kohath son of Levi

Leannoth : possibly a tune: 'The Suffering of Affliction' (NIV marg)

Mahalath : daughter of Ishmael; wife of her cousin Esau,grand-daughter of David; wife of Rehoboam,a musical term (perhaps 'a sad tone' NASB marg.)

Maskil : a literary or musical term

Psalms 137:7

Edomite : resident(s) of the region of Edom
(34° 50´, 39° 7´); (33° 12´, 36° 30´); (35° 5´, 42° 0´); (30° 44´, 35° 36´); (32° 32´, 44° 25´); (33° 31´, 36° 18´)

Jerusalem : the capital city of Israel,a town; the capital of Israel near the southern border of Benjamin
(31° 46´, 35° 14´); (31° 46´, 35° 14´); (31° 46´, 35° 14´); (31° 46´, 35° 14´); (31° 46´, 35° 14´); (31° 46´, 35° 14´)