Have you ever flipped through your hymnal and come across all those indexes in the back? 

The one we probably use most often is the Index of First Lines and Common Titles - a quick way to find the page number for a particular hymn you want to sing or play. Another index that sometimes proves helpful is the Index of Hymn Tunes, where you can look up a hymn by its tune name (for instance, NEW BRITAIN for “Amazing Grace” or HYMN TO JOY for “Joyful, Joyful”).