When the notes are read aloud or sung, they are called 'do, re, mi, fa, sol, la, si'. For example, in the key of C, their relationship with the notes and the solfège is as follows: They always correspond to the diatonic major scale. Numbers 1 to 7 represent the musical notes (more accurately the scale degrees). Numbered notation described Musical notes It is also known as Ziffernsystem, meaning 'number system' or ' cipher system' in German. It dates back to the system designed by Pierre Galin, known as Galin-Paris-Chevé system. 'simplified notation', not to be confused with the integer notation) is a cipher notation system used in Mainland China, Taiwan, Hong Kong, and to some extent in Japan, Indonesia (in a slightly different format called 'not angka'), Malaysia, Australia, Ireland, the United Kingdom, the United States and English-speaking Canada. The numbered musical notation ( simplified Chinese: 简谱 traditional Chinese: 簡譜 pinyin: jiǎnpǔ lit. ( September 2017) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations.