The identifying characteristic of rondo form is its use of

While variations in rhythm can occur in many musical forms, they are not a defining characteristic of rondo form. Rondo is primarily identified by its thematic structure rather than rhythmic complexity. The presence of varied rhythms does not inherently distinguish rondo from other musical forms.

Ritual chants are specific to certain cultural or religious contexts and do not pertain to the structural characteristics of rondo form. Although chant may utilize repetition, it is not a formal aspect of rondo, which focuses on the alternation of a recurring refrain with contrasting material.

Irregular harmony refers to unexpected or unconventional chord progressions and is not a feature of rondo form. In fact, rondo typically employs clear and recognizable harmonic structures that support the repeated refrain, making it accessible and memorable.

While cadences are important in establishing the end of phrases and sections within music, the presence of several cadences is not unique to rondo form. Other forms of music also utilize multiple cadences, so they cannot be used as a distinguishing characteristic of the rondo structure.