Art of the States, an international radio service of contemporary American music, is assembling a circus-oriented program that consists of traditional circus band music and more classical and experimental works inspired by it. They are interested in any releases that you might know of that has anything to do with the circus, clowns, acrobats, etc -- and not necessarily just in name, but stylistically as well.
Matthew Packwood, who works for Art of the States, says that they have an interesting selection of composers right now, including Ives, Copland, Mumma, Erickson, Schuman, and Zorn, but they are looking for more. Composer must be American and there are some guidelines regarding how to submit work (for example, email submissions are not allowed). Click here to understand how to submit a recording.