Verses 1-7 – Music was a huge and important part of worship as it is today. David took it to an organized higher level. This involved many ways to contribute to the worship in the tabernacle. Some prophesied (25:1), some led in thanksgiving and praise (25:3), and others played instruments (25:6, 7). God wants all to participate in worship.
Verses 9-31 – The musicians were divided into 24 groups to match the 24 Levites (24:7-25). This division of labor gave order to the planning of temple work.