What function does the 'playback' feature serve in EarSketch?

The 'playback' feature in EarSketch is specifically designed to allow users to listen to the music they have composed within the software. This functionality is essential for musicians and producers as it enables them to hear how their creations sound in real time, assess their compositions, and make adjustments to improve the quality of the music. By facilitating immediate auditory feedback, the playback feature enhances the creative process and helps users understand the impact of their coding and musical choices, making it a central aspect of the music-making experience in EarSketch.

The other options pertain to functionalities that serve different purposes, such as editing audio files, saving projects, or sharing music, but they do not represent the primary intention behind the playback feature.