דברי הימים א, פרק ו׳, פסוק י״ז

The duties of the Levites underwent a major shift as the center of worship transitioned from a temporary setting to a permanent home in Jerusalem. A central part of their daily service was the music that accompanied the offerings [רד״ק]. Before the permanent Temple was built, the Levites performed their musical duties in front of the tent that King David had set up [מצודת דוד]. During this earlier period, their work was geographically divided. Some Levites stood before the Ark of the Covenant, while others served at the Tabernacle located in Gibeon [מלבי״ם].

This separation lasted until King Solomon built the permanent Temple in Jerusalem. With the completion of this lasting structure, all the singers finally united in a single location [מלבי״ם] and continued their musical service together [ביאור שטיינזלץ]. In this new setting, they performed their singing exactly according to the established order and rules that King David had previously set for them [רש״י, מצודת דוד].

The move to the Temple also brought a physical change to how the Levites performed their service. In the days of the temporary tent, the Levites simply stood on the ground while they sang. In the Temple, however, their position was literally elevated, as they stood upon a special platform built by King Solomon to perform their music [חומת אנך].