Musical composition may also refer to the process by which a piece of music is originated. People who practice composition are called composers. Useful skills in composition include writing musical notation, instrumentation, and handling musical ensembles (orchestration).
Important in much musical composition or musical form and is the scale for the notes used, including the mode and tonic note. Whereas when playing or reading music, only the key signature (set of notes in scale) matters. In music using twelve tone techniques the tone row is even more comprehensive a factor than a scale.