Realization is the art of creating music, typically an accompaniment, from a figured bass, whether by improvisation in real time, or as a detained exercise in writing. It is most commonly associated with Baroque music. Competent performers of the era were expected to realize a stylistically appropriate accompaniment from a mere harmonic sketch, called a figured bass, and to do it at sight. A system that allowed much flexibility, it became a lost art, but was revived in the 20th century by scholar-performers.