Add a line of do to si symbols under the treble symbols in the piano score.
The following figure shows the positions of the names do, re, mi, fa, sol, la, xi and soprano do in C major on the staff. The corresponding phonetic names include a group of small characters C, a group of small characters D, a group of small characters E, a group of small characters F, a group of small characters G, a group of small characters A, a group of small characters B and a group of little boys C (the numbers in the figure are fingering marks).