For an instrument to be featured on this wiki a basic set of features that are idiosyncratic should be present. Features such as having an unusual Interface, Sound Quality, Function, Aesthetic, or instruments that have unusual implications attached to existing are taken into consideration. This page is intended to elaborate on these basic considerations.

Interface is the way that an instrument is interacted with in order to play. Changing the layout of frets on a guitar, changing the tuning of the strings, or changing the way a guitar is plucked are all examples of changing the interface of the instrument. Not all unique changes in interface qualify for an instrument to be on this wiki. Preferably the change in interface is paired with some other quality that is also unique. An instrument that sounds like an existing instrument but has a significant change in the way that they are played can qualify. Some good examples to think of are the various unusual ocarina and various unique keyboard layouts.