Another consequence of the primacy of the composer’s written score is that improvisation plays a relatively minor role in classical music, in sharp contrast to traditions like jazz, where improvisation is central. Improvisation in classical music performance was far more common during the Baroque era than in the nineteenth and twentieth centuries, and recently the performance of such music by modern classical musicians has been enriched by a revival of the old improvisational practices. During the classical period, Mozart and Beethoven sometimes improvised the cadenzas to their piano concertos (and thereby encouraged others to do so), but they also provided written cadenzas for use by other soloists.