16. A computer-readable recording medium storing a music score reading program according to claim 15, characterized in that, upon allocating the actual tone generating musical instruments to the recognized signs of the drum part according to the drum notation estimated by said notation estimating function, if a value of said conversion table designates a half note relative to the drum note originally recognized as a quarter note before estimation, said drum note is converted to the half note.
15. A computer-readable recording medium storing a music score reading program according to claim 9 wherein said notation estimating function estimates a drum notation with respect to drum instruments of cymbals such that, under a condition that drum heads other than a black head exist above a fourth space of the staff, drum notations are classified into a case where the drum heads exist at one staff position and a case where the drum heads exist at two staff positions, said classification is further divided depending on kinds of the drum heads and still further divided depending on tone lengths determined by flags of the drum notes and other tone lengths determined by the kinds of the heads based on existence of the tone lengths of the drum notes derived by said flags, a conversion table is prepared depending on said still further divided classification, and kinds of the drum instruments of cymbals estimated depending on the staff positions of the drum heads, the kinds of the drum heads, a hi-hat open sign relating to the drum notes, a hi-hat close sign relating to the drum notes, an accent sign relating to the drum notes and character strings for designation of drum tones of the notes are specified in the conversion table so as to estimate the drum notation based on said conversion table.