Why is it important to specify tempo in music scripts?

Specifying tempo in music scripts is essential because it regulates the speed at which the music is played, which directly influences the measure and rhythm of the composition. Tempo sets the foundation for the timing of notes and beats, allowing for the intended expression and feel of the piece. By defining the tempo, musicians and programmers can create a consistent rhythmic framework that supports the overall structure of the music. This helps in aligning various musical elements, from melodies to harmonies, ensuring they work cohesively together in the desired style and energy of the piece.

The other options do not focus on the role of tempo in music scripting: choosing instruments, song length, and audio clip visibility are distinct elements that do not inherently require a specific tempo to be effective.