דברי הימים א, פרק ט״ז, פסוק מ״ב

The daily service in the Tabernacle required a careful balance between joyful, powerful music and strict security over the holy grounds. Heman and Jeduthun were entrusted with the trumpets and cymbals [רד״ק, מצודת דוד]. These specific instruments were crafted with a distinct purpose: to produce a loud, resonant sound [מצודת דוד, ביאור שטיינזלץ]. They were played alongside a broader collection of sacred musical instruments, all dedicated to accompanying the singing and music performed before God's Tabernacle [מצודת דוד].

Within this sacred space, the division of responsibilities was clearly defined. While Heman and Jeduthun led the musical performance, the sons of Jeduthun held a completely different position. The primary approach among commentators is that at this early stage, the sons did not participate in the singing at all. Instead, they served strictly as gatekeepers, entrusted with guarding the entrances to the Tabernacle. This arrangement, however, was not permanent. Years later, during the fortieth year of King David's reign, their responsibilities shifted. They received a significant promotion, transitioning from their role as guards to becoming the head singers [רש״י].