Final answer:
The element of music that organizes movement in time is rhythm, which creates a structure for melody and harmony to follow, acting as the guiding force for the flow and timing of music.
Step-by-step explanation:
The element of music that organizes movement in time is rhythm. Rhythm is essential in music as it dictates the temporal placement of sounds, creating a structure for the melody and harmony to follow. It functions similarly to the way patterns create rhythm in visual arts, such as the repetition seen in a series of arches or in the brushwork of a painting. Understanding rhythm is also crucial for distinguishing it from the beat, which is the consistent pulse that underlies the rhythm. While melody refers to the sequence of notes that make up the main tune and harmony refers to the combination of simultaneously sounded musical notes to produce chords, it is the rhythm that guides the flow and timing of the music.