The infrastructure for arts and cultural support in the United States is complex and adaptive. Citizens who enjoy the arts can choose from a wide array of drama, visual and media arts, dance, music, and literature available in formal and informal settings--theaters, museums, and concert halls, but also libraries, schools, places of worship, open-air venues, restaurants or nightclubs, and, via technology, at home or on the move. In the last two decades, the number of arts and cultural organizations has grown, even as revenues from sales and attendance have risen to all-time high levels. In the following chapters, this monograph identifies three basic types of financial support for the arts: (1) direct public funds awarded by the National Endowment for the Arts (NEA) and by state, regional, and local arts agencies; (2) funding from federal departments and agencies other than the NEA; and (3) private sector contributions, which make up the lion's share of contributed income for arts organizations. This third revenue stream flows from individual and corporate donors and from charity foundations, and it flows more smoothly because of incentives in the U.S. tax system.