Do rhythms have to repeat measure after measure or can there be variety?

Rhythms do not have to repeat measure after measure; variety is a fundamental aspect of music. Composers often use different rhythmic patterns to create interest, contrast, and emotional depth. This can include syncopation, changes in tempo, or varied note durations, all contributing to the overall texture and dynamics of a piece. Ultimately, the choice between repetition and variety depends on the artistic intent of the music.