Strategy. Under normal market conditions, the Fund invests substantially all of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund attempts to invest all of its assets in tax-free securities, it is possible that a portion of the Funds net assets may be invested in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund may invest in municipal securities rated in any rating category (or unrated or short-term rated securities of comparable credit quality), including municipal securities rated A or lower by one or more U.S. nationally … Show more… Under normal market conditions, the Fund invests substantially all of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund attempts to invest all of its assets in tax-free securities, it is possible that a portion of the Funds net assets may be invested in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund may invest in municipal securities rated in any rating category (or unrated or short-term rated securities of comparable credit quality), including municipal securities rated A or lower by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality), below investment grade securities (or "junk bonds") and defaulted securities. The Fund may invest in securities of any maturity or duration. The Fund does not necessarily focus its investments in a particular state or territory and will not invest more than 30% of its total assets in municipal securities of any one state or territory. The Fund may invest up to 15% of its total assets in municipal securities issued by U.S. territories. The Fund is a "non-diversified" fund, which means it generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Although the investment manager searches for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Funds range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Funds portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. When selecting securities for the Funds portfolio, the investment manager may consider existing market conditions, the availability of lower-rated securities, and whether the difference in yields between higher and lower-rated securities justifies the higher risk of lower-rated securities. Show less