Is a short instrumental composition based on a hymn tune that reminds the congregation of the hymn's melody?

Yes, a short instrumental composition based on a hymn tune that reminds the congregation of the hymn's melody is often referred to as a "hymn prelude." It serves to evoke the hymn's themes and melody, preparing the congregation for singing or reflection. This musical form enhances the worship experience by linking the instrumental music with the congregational hymn.