"Rolf call of b" is the default statement in the ostinato name method, and the b in the ostinato should be si. In the early days, they pronounced si, while the translators introduced in China at that time would pronounce si as xi. Later, Western English-speaking countries began to introduce and popularize the pronunciation of ti, but China did not change it at the same time. historical reasons. So both are correct. Si is an ancient reading. Ti is a new way of reading.

British music educator Sarah Ann Glover changed the si consistent with Sol to ti to improve the acronym method and make the acronym method is able to name all 17 tones with regularity. There are many tune singers who switch to ti when they sing too much ti. Coupled with the recent popularity of the Kodály teaching method in some Western countries, this teaching method relies heavily on the first tone system, and it has gradually become the mainstream in the West.

According to the notes on the piano, C D E F G A B is the note name, and do re mi fa sol la si is the roll call. So here "B" reads "si". Theoretically speaking, si as the solfa of B in the fixed key is more in line with tradition, but there are some people who use the fixed key solfa method and are influenced by the first key to sing ti. Roll call is the giving of independent names to the seven basic syllables, corresponding to the fixed syllables, which are the names used when singing.

It was originally created by the medieval Italian priest Guido. However, many countries have different names. In middle school music teaching, many teachers have different pronunciation requirements for "ti" and "si" in the name system. Generally speaking, there are three types, namely [si], [xi] and [ti]. The problem is that many teachers teach students one of the pronunciations while trying to correct the other two (which is considered incorrect). Therefore, it creates a bit of confusion among the students and leaves them confused.