Introduction

In this paper, Musical Expression is the synthesis of meaningful musical gestures which are usually categorized on the frequency domain as vibratos, trills, grace notes, appogiaturas, dynamic changes, etc. Gestures on the time domain are tempo, rubato, rhythmic patterns and durations. The articulation and phrasing of a sequence of notes depends upon combinations of gestures in the time and frequency domains. A performance of a musical event is the relation among the Physical Model of the instrument, a set of rules which describe a sequence of sounds plus their expressive parameters to play the notes. Expressiveness can be applied on a single note basis or to a whole sequence of notes as in musical phrase.