Reference: Gittith
American
The word Gittish signifies belonging to Gath. It probably denotes either a musical instrument or a kind of music derived from Gath, where David sojourned for a time during the persecution of Saul, 1Sa 27:1-7. The word Gath also signifies in Hebrew a winepress. Hence not a few have supposed that it denotes either an instrument or a melody used in the vintage. It is prefixed to Ps 8; 81; 84, all of which requires an animated strain of music.
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Easton
Fausets
Title Psalm 8; Psalm 81; Psalm 84: An instrument, or else tune, invented in Gath, from whence David brought it after his sojourn there with Achish (1Sa 27:2). Others take it from garb, "a winepress," being used on occasions of joy like the vintage; all three psalms having a joyous character. There may be an enigmatical reference to Messiah treading the winepress (Isa 63:3; Re 19:15):
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Hastings
Morish
Git'tith
Apparently a musical instrument, the nature of which is unknown. From its name it has been supposed to have formerly been used at Gath. Others connect it with Obed-edom the Gittite. It occurs only in the headings of Ps. 8; 81; and 84.
Smith
Gittith,
a musical instrument, by some supposed to have been used by the people of Gath, and by others to have been employed at the festivities of the vintage. Psal 8,81,84.