Arranging music usually involves:

The correct choice emphasizes the role of arranging music, which involves preparing compositions for a specific performance context. This process often includes taking an existing piece of music and adapting it to fit the needs of the performers, the venue, or the desired style. This can mean changing instrumentations, altering parts, or even expanding sections to better suit the performers or audience.

While other aspects, like composing new melodies or scheduling rehearsals, are important in the music-making process, they do not encapsulate the primary action of arranging music. Arranging focuses specifically on how the music is presented and structured for performance, making it essential for musicians to interpret and deliver pieces effectively. Recording live performances, although a valuable part of the music process, falls outside of the arrangement phase and pertains more to documentation and distribution.