In at least one respect, classical music is superior to popular music. Classical music (understood as common practice composition) has greater potential for expressiveness and, consequently, has more potential for psychological insight and profundity. The greater potential for expressiveness in classical music is due, in large part, to it greater harmonic resources. The harmonies in classical music are more likely to be functional, more contrary motion is employed, and modulation is more common. Although popular music employs rhythms not found in classical music, on the whole there is less rhythmic variety in popular music than there is in classical.