דברי הימים א, פרק ו׳, פסוק ט״ז

The establishment of Jerusalem as the center of government and holiness brought a fundamental shift to the historical role of the Levites. For generations, their primary duty was to carry the Ark of the Covenant and the vessels of the Tabernacle on their shoulders as the Israelites traveled. However, once King David brought the Ark to Jerusalem and placed it in a special tent, its years of wandering—from places like Kiriath-jearim to the home of Obed-edom—finally came to an end [רש״י, רלב״ג, רד״ק, מצודת דוד]. This transition from a nomadic existence to a state of permanence allowed David to enact a major reform in the holy service. Because the Levites were no longer required to transport the heavy sacred items, they were suddenly free to fully devote themselves to an entirely new purpose [ביאור שטיינזלץ].

David transformed their duties from physical labor into an organized system of song and music, appointing specific men to take responsibility for singing and playing instruments in the House of God [רד״ק, מצודת דוד, מלבי״ם, ביאור שטיינזלץ]. This new musical service began the moment the Ark reached its permanent resting place [רד״ק]. Regarding where these musicians actually performed before the permanent Temple was built, the primary approach among commentators is that David established their singing right away at the tent in Jerusalem, where they served before the Ark just as they would eventually do in the Temple [רלב״ג, רד״ק, מלבי״ם]. However, another perspective suggests that the singers initially served before the Tabernacle at the great high place in Gibeon. According to this view, it was only later, when King Solomon constructed the Temple in Jerusalem, that they were officially stationed to sing in the permanent building [רש״י, רלב״ג].

The specific physical arrangement of these singers, as determined by David, also established enduring rules of honor and hierarchy within the service. The musicians from the family of Kohath, whose work was considered the most distinguished, were positioned directly in the middle. To their right stood the members of the Gershon family, and to their left were the members of the Merari family. This specific formation teaches a lasting principle regarding respect: the greatest and most important individual always stands in the center, the second in importance stands to his right, and the third stands to his left [רלב״ג].