Blog series Sound and VisionAuthor Jack Copeland, Director of the Turing Archive for the History of Computing and Jason Long, ComposerOriginally published in September 2018.A key problem facing audio archivists is how to establish the correct pitch of a historical recording. Without some independent means of knowing how the original sounded, it can be very difficult—or even impossible—to tell whether an archived recording is playing at the right pitch. An important case in point is the earliest ...