Have you ever needed an instrumental piece for worship at the last minute? If you've found yourself in this situation, then you know it can be complicated and time consuming to track down a piece that will work. Because, after all, you're not just looking for any piece of music; you're looking for something that fits the theme of the day, is the right length, is in the right key, is manageable enough to put together the morning of, and is easily accessible (i.e. downloadable or something you already own).
As someone who's been in this situation many times, I've come up with a quick and easy solution: creating instrumental arrangements from music I already have (choral octavos, solo piano music, hymn harmonizations, vocal collections, etc.).