Why do we bother about copyright?
Copyright laws exist in order to support artists/authors who produce artistic works, and whose royalties provide their income. There is a lot of legal complexity which supports this, but that is the core intent of all our effort. Artistic works may include song words, song tunes or music, poems, photos, music, videos, paintings, etc.
Note that the performance of music by churches in worship services, weddings, and funerals – whether in a church or other setting – is granted a specific voluntary exemption from copyright licensing.