Q2L3

The familiar (ký âm quen thuộc của địa phương tây) - writing down music using symbols - has taken thousands of years to develop

In ancient times, elaborate music (đã tồn tại), even though it was never written down.

Eventually, however, (các nền văn minh)(s) felt the need to record their music, and so the search began for a system of symbols that could reliably denote the exact pitch of the note to be sung or played, and at the same time tell the performer(s) how long that note should be held.

Eventually, however, civilization(s) felt the need to record their music, and so the search began for a system of symbols that could (biểu thị cao độ chính xác của nốt nhạc) to be sung or played, and at the same time tell the performer(s) how long that note should be held.

The ancient Greeks and Romans did this by using their alphabetical letters in a variety of ways, but (sự phát triển chậm chạp của ký âm) could not keep pace with increasingly complex musical developments

The ancient Greeks and Romans did this by using their alphabetical letters in a variety of ways, but the slow development of notation could not (theo kịp) increasingly complex musical developments.

The ancient Greeks and Romans did this by using their alphabetical letters in a variety of ways, but the slow development of notation could not keep pace with (phát triển càng ngày càng phức tạp của âm nhạc). 

The 13th century saw the introduction of colours to (thể hiện) more complex note values. 

With the invention of printing in the 15th century, the writing of notes was (tiêu chuẩn hóa) to black and white and the number of lines became fixed at five. 

By the middle of the 18th century, (ký hiệu âm nhạc) had settled down to its modern usage.