Musical improvisation is when musicians play a tune which does not exist yet. They play what comes to their mind. In the case of groups of musicians, they may have agreed on a few basic rules beforehand. Generally, improvisation requires a few skills:
- The person improvising must be able to play the instrument fairly well.
- The person must know some basic rules or parameters on the kind of music played
- The person must be creative
Musical composition is different: With composition, people first write down and arrange the music, before playing it, with improvisation they play right away.