Abstract: The objects of the present invention are to provide a music sheet on which all the notes can be presented without using sharps or flats and to make writing and reading music easier. A music sheet is formed by providing base lines (3) at a certain distance, a center line (4) positioned between adjoining base lines, and two supplementary lines (5) which are aligned in such a way that the supplementary lines equally divide a space between the base line and the center line into three and preferably presented in such manner that they are distinguishable from the base lines (3) and the center line (4). With the above constitution, all the tones within an octave can be presented on a musical score without using sharps or flats, and writing music is easy because of the supplementary lines provided beforehand.