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What exactly do CDEFGAB and 123456 in music mean?

The CDEFGAB letters refer to sound names, and their pitches are fixed. Its foreign name is pitch names.

123456 is a numerical notation borrowed from mathematics.

1. The white keys and black keys on the piano keyboard are arranged according to fixed rules, and the fixed height of the note on each key is the note name

Modern music uses seven English The letters C D E F G A B (or its lower case) are used to mark note names. For these seven tones of different pitches, the pitch distance between adjacent tones can be divided into semitones and whole tones. Among them, the relationship between E and F and B and C is a semitone, and the relationship between other adjacent tones is a whole tone.

2. The pronunciation of the seven "roll call" of the major scale is:

do, re, mi, fa, sol, la, si (English Pinyin)

The numbers borrowed from mathematical notation are:

1, 2, 3, 4, 5, 6, 7

Extended information:

Fixed Solfa

Sing the note names C, D, E, F, G, A, and B as do, re, mi, fa, sol, la, and si respectively. They are fixed and do not depend on the key. The singing method changes with the change of the sexual mode. This singing (notation) method is called the "fixed solfa method" (that is, the solfa of each note is fixed.)

The high pitch of each note are fixed, their positions on the keyboard and violin are also fixed, and their positions on the staff are also fixed, and then their roll call is fixed, so that their corresponding relationship is fixed, so when you see When you look at the notes on the score, you will immediately think of its roll call and its position on the violin. Very convenient for learning piano and violin.

Baidu Encyclopedia - Sound Name

Baidu Encyclopedia - Roll Call