The chanter is the part of the bagpipe upon which the player creates the melody. It consists of a number of finger-holes, and in its simpler forms looks similar to a recorder. On more elaborate bagpipes, such as the Northumbrian bagpipes or the Uilleann pipes, it also may have a number of keys, to increase the instrument's range and/or the number of keys (in the modal sense) it can play in. Like the rest of the bagpipe, they are often decorated with a variety of substances, including metal (silver/nickel/gold/brass), bone, ivory, or plastic mountings.