in music, 4567 reads fa, sol, la and si. This pronunciation is called roll call.

roll-call:

1. Roll-call is a musical term, and it is called roll-call when singing melody for the convenience of singing music.

2. Sing the seven basic tones in the natural major mode as do, re, mi, fa, sol, la, si (or ti)do (treble) respectively.

3. In the specific use of roll-call, there are two kinds of roll-call methods: the first-tone roll-call method and the fixed-tone roll-call method.

4. From ancient times to the present, there have been many different roll names all over the world. For example, the ancient Greek four-tone series (ta, ti, to, te); Seven syllables in India (sa, ri, ga, ma, pa, da, ni); In ancient China, seven syllables (Shang, Chi, Gong, Fan, VI, V, B) in the seven-tone scale were used. Since the beginning of the 2th century, there are two kinds of roll-call methods widely used in normal music colleges in China: one is the first-tone roll-call method, and the other is the fixed-tone roll-call method.