For anyone involved in the digitization of piano rolls, this is highly recommended reading. This 170-page volume (ISBN 978-3-948808-38-9, retail price €34.90, ISSN 2365-9149), published as part of the DM Studies series of the German Museum (Deutsches Museum), was written by Judith Kemp. This comprehensive survey of the field—from the earliest efforts to digitize piano rolls through more recent developments—is based on months of research and interviews with leading experts from around the world. The printed edition can be ordered from the Deutsches Museum website. An English PDF edition is available there as a free download.