Thread - Arrangements vs. Editions

Here's the definition, as used here: It's an arrangement only if you have re-scored the work from its original setting (like going from 5 voices down to 4), or if you have added new material not present in the original (such as an organ interlude based on themes of a movement). Otherwise, it's an edition. Taking a 1588 mass for 5 voices and omitting a movement is not an arrangement but an abridged edition. It is still for 5 voices, it's even in the original mode or key, and the notation is updated from what was used in the original, and the one section has been omitted.