"Do, re, mi, fa, sol, la, ti" are the seven notes of the musical scale in Western music. This system, known as the solfège, helps musicians identify and sing pitches. Each note corresponds to a specific frequency, creating a foundation for melodies and harmonies. These notes can be represented on a piano keyboard or in written music. The sequence starts with "do" and ends with "ti," after which it returns to "do" in a higher octave. This cyclical pattern is essential for understanding music theory and is widely used in teaching music to beginners.