דברי הימים א, פרק ט״ו, פסוק כ׳

During the grand procession, specific Levites—Zechariah, Uzziel, Shemiramoth, Jehiel, Unni, Eliab, Maaseiah, and Benaiah—were given a special musical role. Although their regular daily duty was to serve as gatekeepers, they were specially reassigned for this event to act as musicians and singers [רש״י, ביאור שטיינזלץ].

The primary focus surrounding these men involves the exact nature of the instruments they played. The primary approach among commentators is that they played a specific, well-known musical instrument, which is also referenced in the opening titles of certain Psalms and was used to accompany those specific songs [רש״י, מצודת דוד, ביאור שטיינזלץ].

Beyond identifying it simply as a musical instrument, there are different ideas about how it worked and why it received its specific name. One explanation focuses on its physical structure, describing it as a wind instrument powered by airflow. In this view, leather bellows were used to push air into hollow reeds to produce pleasant sounds. The unique name of the instrument stems from the fact that its internal reeds and operating mechanism were completely hidden from view [רלב״ג]. Alternatively, the name might not describe the instrument's hidden mechanics, but rather the people who typically played it. According to this perspective, these were a specific type of instrument that, by tradition, was usually played by young women [ביאור שטיינזלץ].