This appendix is not so exhaustive that it could constitute a separate study independent from the orientation of the present book. Its purpose here is, on the one hand, to provide fuller information on the sources and topics quoted from in the above notes; and, on the other hand, to project outlines for a properly specialized study that has yet to be carried out. Indeed, the thorny problems raised by the annotated scores of Chopin's students and associates have not hitherto been subjected to any systematic or comparative approach. The present appendix, as up-to-date as possible, makes no claim to definitive conclusions, particularly since other annotated scores, at present unknown, inaccessible or presumed lost, may well surface in the course of time.

Of the seven sources examined, the first three (Stirling, Dubois-O'Meara, Jędrzejewicz) are of prime importance, as much by virtue of their provenance as of their contents. The specific character of each one, together with the different working conditions under which each of them was marked, have sometimes made it convenient to present them here in different ways. If this study has managed to solve some hitherto unsolved problems, it has also inevitably raised some new ones, or had to suggest probabilities in some cases rather than definite answers.