Strong's #516: 'Al tashcheth (pronounced al tash-kayth')
from 408 and 7843; Thou must not destroy; probably the opening words to a popular song:--Al-taschith.
Brown-Driver-Briggs Hebrew Lexicon:
ּׁ
'al tashchêth
Al-taschith = "do not destroy"
1) (Hiphil) a command to the chief musician, or perhaps the title of a melody used for several Psalms
Part of Speech: noun masculine
Relation: from H408 and H7843
Usage:
This word is used 4 times:
Psalms 57:1: "To the chief Musician, Al-taschith, Michtam of David, when he fled from Saul"
Psalms 58:1: "To the chief Musician, Al-taschith, Michtam of David. Do ye indeed speak righteousness, O congregation?"
Psalms 59:1: "To the chief Musician, Al-taschith, Michtam of David; when Saul sent, and they watched"
Psalms 75:1: "To the chief Musician, Al-taschith, A Psalm or Song of Asaph. Unto thee, O God, do we give thanks, unto thee do we give thanks:"