The fund normally pursues its investment objective by investing at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in lower-rated debt securities, including corporate debt securities and securities that are convertible into common stock or have warrants to purchase common stock. It may invest up to 20% of its net assets in foreign securities (including emerging market securities and American Depository Receipts ("ADRs")). The fund may invest up to 20% of its net assets in municipal securities.