The meaning of Muth-labben in the Bible
(From Easton's Bible Dictionary)

occurring only in the title of Psalms 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 (II Samuel 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.

See more on the meaning of Muth-labben in the Bible:
Muth-labben {International Standard Bible Encyclopedia}

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