5. A pitch curve generation apparatus comprising: a singing synthesizing database storing therein, for each individual one of a plurality of singing persons, at least melody component parameters defining a melody component model that represents a variation component presumed to be representative of a melody among variation over time in fundamental frequency component between notes in singing voices of the singing person; an input section to which are input singing synthesizing score data representative of a musical score of a singing music piece and information designating any one of the singing persons for which the melody component parameters are stored in said singing synthesizing database; and a pitch curve generation section which synthesizes a pitch curve of a melody of the singing music piece on the basis of a melody component model defined by the melody component parameters, stored in said singing synthesizing database for the singing person designated by the information inputted via said input section, and a time series of notes represented by the singing synthesizing score data.
6. The pitch curve generation apparatus as claimed in claim 5 , wherein the pitch curve generation section synthesizes the pitch curve of the melody of the singing music piece by segmenting the time series of notes, represented by the singing synthesizing score data, into sets of notes each comprising two or more notes and reading out, from the singing synthesizing database, the melody component parameters corresponding to the sets of notes.