Robbie, the American Theater Organ Society (ATOS) main address,
(which may forward the application to a local chapter) is:

    ATOS Membership Office
    P.O. Box 551081
    Indianapolis, Indiana 46205-1081

I might add that there is a helluva lot more news and pictures at the
theatre organ site, not related to the ATOS, at

    http://www.wcbi.com/organs.

Drop me a line if anyone needs help.

Bill Ryan