Bach (1685-175) is the most important founder in the history of music. He laid the foundation of the whole western music and was recognized as the "father of classical music". His musical attainments are very high, and he is known as the "God of Music". His works were not only popular in Europe at that time, but also widely played and appreciated today.

Bach's music works cover many fields, such as religion, secularism, instrumental music, vocal music, etc. His works, such as Passion of Matthew, goldberg variations and Dedication of Music, are all classics in classical music. His music style is rigorous and complicated, which has a great influence on later musicians.

When evaluating Bach's musical attainments, we can look at it from the following aspects:

1. Creation breadth: Bach's works are rich in types, covering various popular musical forms at that time, such as fugue, suite, concerto, orchestra and chamber music. His works are huge, estimated to be about 6,, including many religious choruses, hymns and other secular music works.

2. Technological innovation: Bach has made great contributions to the development of music history by constantly exploring and innovating in his music creation. His works are of great artistic value in harmony, counterpoint and melody development. For example, his Piano Music Collection with Equal Rhythm adopted the method of evenly distributing octaves, which laid the foundation for the development of tonal music in later generations.

3. Music theory: Bach also has high attainments in music theory. His Dedication to Music is an important work of music theory, which has a far-reaching impact on the development of music theory in later generations. In addition, he also created many teaching materials about keyboard playing skills, which contributed to the development of piano playing technology.

4. Influence: Bach's musical achievements had a far-reaching influence on later musicians. Many famous composers, such as Mozart, Beethoven and Schubert, have been inspired and influenced by Bach. At the same time, Bach's music has become an important part of Christian religious music, which is of great significance to the inheritance and development of western culture.

To sum up, Bach's musical attainments are very high, and his works play an important role in the history of music. His musical achievements are not only reflected in the creative breadth and technical innovation ability of his works, but also in his influence on later musicians and his contribution to music theory. Therefore, Bach is undoubtedly one of the greatest composers in the history of music.