New perspectives are being opened for the International Standard Music Number in the form of "digital music prints." The "Music Publishers' International ISMN Directory" (M-PIID), which is edited by the International ISMN-Agency and published by the K.G. In its 4th edition (Munich 2003) Saur Verlag lists for the first time the URLs of over 400 providers of printed music which is downloadable in digital formats. However, this number of records, the result of an initial search in the internet, will by no means comprise the entire spectrum of such "digital suppliers." The editorial staff of the M-PIID will increase its efforts for the coming editions of the directory in order to provide a more comprehensive picture of this growing Internet market.

The phenomenon of digital suppliers of printed music raises similar questions with reference to the rules of ISMN assignment, as is the case with the ISBN and its relation to eBooks and eTexts. Those responsible for the maintenance of the ISMN system will have to define the term "digital music print" more precisely and will have to decide about how the different digital formats with one and the same content are to be dealt with.

Most of the "digital suppliers" who were included in the first survey offer printed music as downloads free of charge (e.g. Project Gutenberg Music Website or Stretta Music GmbH ). Since the International Standard Music Number may used "to identify printed music, whether available for sale, hire, gratis or for copyright purposes" (ISMN Users' Manual, Chapter 3), there is no reason to exclude this group of digital suppliers from ISMN assignments, especially from the point of view of a complete bibliographical listing of printed musical works.

Ulrich Wegner