As a language and music theory expert, I can provide a comprehensive answer to your question regarding the relationship between the syllables "Si" and "Ti" in the context of solfège, a system used to teach music sight-reading and ear training.

Firstly, let's clarify the solfège system. It is a method of teaching music that was developed in the 11th century by the French music theorist and composer, Guido of Arezzo. The system assigns a unique syllable to each note of the musical scale, which helps students to learn and memorize the scale and the relationships between the notes. The traditional solfège syllables are Do, Re, Mi, Fa, Sol, La, and Si. These syllables are used in many languages, including Romance languages like Spanish, Portuguese, and Italian.

However, it's important to note that there is a variation in the solfège system that has been used in some countries, including the United States. This variation was indeed revised in the 1800s to ensure that each note begins with a different letter. In this revised system, the syllable "Si" is replaced with "Ti". The reason for this change was to avoid confusion with the syllable "Si" which, when sung quickly, can sound like "Do" due to the similar vowel sound. By changing "Si" to "Ti", the system maintains a clear distinction between the syllables for all seven notes of the diatonic scale.

The revised solfège system looks like this: Do, Re, Mi, Fa, Sol, La, Ti, and then back to Do for the octave. This system is particularly useful for singers and musicians who are learning to read music and understand the structure of the scale. It also helps in teaching the concept of intervals, as the distance between syllables can represent the musical intervals between the notes.

Now, let's address the statement "The 7th Note SI is TI." This statement is accurate within the context of the revised solfège system. In this system, the seventh note of the diatonic scale, which would traditionally be "Si", is instead called "Ti". This change helps to maintain a clear and distinct set of syllables that correspond to each note, without any overlap that could lead to confusion.

In conclusion, whether you use "Si" or "Ti" for the seventh note depends on the solfège system you are referring to. If you are using the traditional system, as found in many Romance languages, the seventh note is "Si". However, if you are using the revised system, which is common in the United States and other countries, the seventh note is "Ti". Both systems are valid and serve the purpose of teaching music theory in a clear and memorable way.

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The 7th Note SI is TI. In Romance languages (Spanish, Portuguese, Italian, etc.) notes are named with solf--ge syllables--DO, RE, MI, FA, SOL, LA, SI, DO. The solf--ge system used in many countries--including the United States--was revised in the 1800's so that all notes begin with a different letter.read more >>