muthlabben

from Easton's 1897 Bible Dictionary
Muth-labben
occurring only in the title of Psalm 9. Some interpret the words
as meaning "on the death of Labben," some unknown person. Others
render the word, "on the death of the son;" i.e., of Absalom (2
Sam. 18:33). Others again have taken the word as the name of a
musical instrument, or as the name of an air to which the psalm
was sung.
    

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