Check the Library Catalog for some useful periodical titles (or you may want to browse the shelves, as we have a fairly small print periodical collection). "Periodicals" is a catch-all term that encompasses most serials (arriving on a schedule). Popular magazines, trade publications, and scholarly journals can all be considered periodicals (see link below for more).
Some titles that may prove useful include American Theatre, Journal of Dramatic Theory and Criticism, and perhaps even some popular magazine titles such as Entertainment Weekly.
We also have many titles available online and often many older periodicals are kept in our bound collection (also searchable in the catalog).