対話型進化論的計算を

　本研究の目的は，R.Schumann

In recent years, computer music software has been widely used from novice users to professional musicians. It provides users with the ability to compose, perform and publish digital music. Most of current computer music software mainly focus on supporting a music creation process of an individual user. In contrast to digital music creation of an user, online collaborative music creation among multiple users is very difficult, because users have no means to communicate and negotiate to share an ambiguous musical idea among the users, which is inevitable in collaborative music composition in nature. In this paper we propose a support system for online collaborative music creation among casual users. The proposed system called Marble has a piano roll interface which allows a group of casual users to collaboratively edit music data and to synchronize music data among the users. We have conducted an experiment to observe how Marble could improve a collaborative music composition process. As the result of the experiment, we have found that Marble helped users collaboratively create better music with a smaller number of operations, than that of an existing system.