class Score{
public:
    Score CreateScore(PartNote newnote);

private:
    Score const * const parent;
    ScoreTemplate const * const sctmplt;

    Score(Score const*const old, PartNote const*const newnote):sctmplt(old->sctmplt),notes(newnote), parent(this){}

};

Score Score::CreateScore(PartNote const newnote)
{
    Score ret = new Score(this, newnote);
    return ret;
}