The patent announcement can be opened yesterday. Why is there no content when it is opened today?

Reference answer: To clarify the timbre of a work, we must first rely on hearing, which can often clearly feel the basic modes and melody characteristics of the music (various modes or sizes based on pentatonic scale, etc.). ). In addition, we can also make use of some objective features, such as the alto organization in the melody and the key signature representing the sound organization, as well as the time scales in the elegant music scale, the Yan music scale, the harmony mode and the melody mode, or the endings and chords of the music. In most cases, the ending sound of a piece of music is always the tonic, the last chord is always the tonic, and the bass of the chord is always the tonic, with few exceptions.