Simplify the following text for a Grade 5 native English-speaking person.
Original: A change of chord , or `` chord change '' , generally occurs on an accented beat , so that chord progressions may contribute significantly to the rhythm , meter and musical form of a piece , delineating bars , phrases and sections .
Simplified: Chord progressions are used in many types of music . How a piece of music sounds has to do with its chord progression .