Abstract
Automatic music accompaniment system synchronizes with human player's performance. Eurydice is one of such systems that model the generation process of the performance with a probabilistic model, which can therefore follow flexibly the performance in presence of tempo changes, mistakes, skips and repeats. As the tempo control is made by following the player's input, it is a problem while the player's part has a long rest in the score. In this study, we discuss tempo control of the accompaniment by key tapping. To determine a key for the tap operation, wrong key rate was experimentally evaluated across various distances between keys. Then, as a preprocessing, we inserted necessary notes for the tap operation into the Standard MIDI file (SMF) for Eurydice, so that Eurydice controls tempo and proceeds forward when the player tapped the inserted notes. The inserted notes cause no sounds, because they do not exist in the original musical score. We implemented these new features and confirmed a successful operation.
