In jazz , however , the skilled performer will interpret a tune in very indi very individual ways , never playing the same compostion exactly the same way twice. Depending upon the performer's mood and personnal experience , interactions with the fellow musicians , or even members of the audience . Improvisation is clearly one of its key elements. This feature is fundametal to the nature of jazz. While in European classical music elements of interpretation , ornamentation and accompaniment are most of the time left to the performer's discretion ; the performer's primary goal is to play a composition as it was written . In jazz you just play it how you fell it ...