Final answer:
Subito forzando is a dynamic musical notation instructing a sudden, strong emphasis on a note or chord, representing a sudden change in the level of sound.
Step-by-step explanation:
Subito Forzando, often abbreviated as SFZ or sforzando, indicates a sudden change in the level of sound in music. It is a dynamic instruction to the performer to play a note or chord with a sudden, strong emphasis. This is not to be confused with a slow decrease in tempo, a change in the melody, or an instruction to play very softly. Instead, it relates directly to the dynamics of the music, creating an effect of surprise or added emotional weight.