The IMS is committed to a “world community of musicology.” To encourage everyone to join, we keep our fees as low as possible and adjust them according to the Gross Domestic Product (GDP) of your country of residence. The primary source for all calculations is the “GDP per capita, current prices,” published by the International Monetary Fund (IMF). Additional sources for countries for which data is not available are the World Bank (WB) and Central Intelligence Agency (CIA).