There is no authority higher than the local level. We are not a denomination. No counsel, convention or delegation impose a system of beliefs on the local congregation. The local congregation is under the responsibility of overseers . The names elders and bishop are synonymous terms used to describe the same office.
Deacons assist the elders in the physical matters of the congregation.
Giving is a regular part of a Christian's responsibility. We are instructed to sing. The Lord's Supper Communion is practiced weekly as was the pattern of the New Testament church. Although intimated in the New Testament by the use of forms of the Greek word psallo , instrumental music is neither specifically commanded nor is it condemned. Each congregation has the liberty to use or not use instrumental music in worship.