Shepherd's Flute
The shepherd's flute. A dual-piped flute of reed is generally carried by the Arab shepherd. It is true that minor strains of music come from this flute, but the heart of the shepherd is stirred, and the sheep of the flock are refreshed by the invigorating music that comes from this simple instrument. There can be little question but that David used such an instrument when he was with his flock, in the same way the shepherd lads have done for centuries around Bethlehem. It is of interest to know that the word in the Arabic language which is the equivalent of the Hebrew word for "psalm" is mazmoor, which means "played on a pipe or flute." [Manners And Customs of Bible Lands]
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