One of the characteristics of authentic music is solo improvisation, a style that is rarely heard and appreciated today. Each performance is a unique experience where the musician improvises following the precise rules and concepts of the Radif repertoire.  The choice of mode is usually made with regard to the ambience.  This is a matter of intuition rooted in years of accumulated experience.  The best choice is usually made on the stage.    Great performances are known for great improvisations.  The time, the place and audience all have an effect on the music that is being improvised.  In the hands of a learned and skilled musician, music becomes a living language, charged with passion, creativity, always new, yet embodying the cultural values and traditions that have been handed down for centuries.  No two performances are ever alike.