In the piano writing of the Romantic generation of the 1830s, in fact, a fully pedalled sonority becomes the norm: the piano is expected to vibrate fairly constantly, and an unpedalled sonority is an exception, almost a special effect. Furthermore, the phrase is now shaped at least partially by changes in this full vibration. The change of pedal is crucial to the conception of rhythmic movement and to the sustaining of the melodic line over the bass.