Psalms 68:1

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

Psalms 4:1-8

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

Selah : a musical notation for crescendo or emphasis by action (IBD)
(30° 19´, 35° 27´)

Psalms 6:1-10

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

sheminith : a musical term: an 8 stringed lyre or 'down an octave' (NASBfn)

Sheminith : a musical term: an 8 stringed lyre or 'down an octave' (NASBfn)

Sheol : the place of the dead