MACHALATH or MAHALATH
Text: [Heb.] This word occurs in the title of Psalms liii, and lxxxviii., the former is inscribed to the "chief musician upon Mahalath", the latter to the "chief musician upon Mahalath Leannoth." Mahalath is by some authors traced (like Machol), to a root meaning pierced or bored, hence it is thought these Psalms were accompanied by flutes. It is generally thought that the term leannoth refers to antiphonal singing. Other writers consider the titles of these and several other Psalms to be a reference to well known tunes to which they were to be sung.
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Source: 125