A music score display data arranging unit provides music score display data for displaying a music score by placing music score notational elements on a given display area in one or more staff tiers, each staff tier containing one or more measures of variable lengths based on inputted music performance representing data. Also provided are optoelectronic modules and methods of forming optoelectronic components. The main body includes a first annular end portion directly or indirectly fixed to the steering gear box, and a second annular end portion. A flow ratio of the nitrogen-containing gas to the oxygen-containing gas is controlled to modify the work function.