piece of music: member of a music collection and inhabitant of islands of music. Groups of similar pieces of music (also known as genres) like to gather around large mountains or small hills depending on the size of the group. Groups which are similar to each other like to live close together. Individuals which are not members of specific groups usually live near the beach and some very individualistic pieces might be found swimming in deep water.

islands of music: serve as graphical user interface to a music collection and are intended to help the user explore vast amounts of music in an efficient way. Islands of music are generated automatically based on psychoacoustics models and self-organizing maps.