The investment seeks maximize total return consisting of high current income exempt from federal income tax and capital appreciation. The fund invests at least 80% of assets in U.S. dollar-denominated fixed-income securities that provide income exempt from federal income tax (municipal bonds). While the fund typically invests in a diversified portfolio of municipal bonds, it may invest up to 20% of assets in taxable fixed-income securities, including taxable municipal bonds and non-U.S. dollar-denominated foreign debt securities such as Brady bonds and sovereign debt obligations.