Fingering is the choice of which fingers an hand positions to use when playing a musical instrument. For example, when playing the piano, chords or melodies can often be played with a variety of different assignments of fingers to played keys. Fingering, in this context, is the choice of which finger to use for which key, for each note. Fingering typically changes throughout a piece; the challenge of choosing good fingering for a piece is to make the hand movements as comfortable as possible without changing hand position too often. A fingering can be the result of the working process of the composer, who puts it into his manuscript, an editor, who adds it into the printed score, or the performer, who puts his own fingering in the score or in his performance.