If you're tuned to 92.9 Mhz at 9 this morning you can hear Graham
Abbott's program talking to Calvin Bowman about how the organ works,
and exploring the grand organ at Melbourne Town Hall.

http://www.abc.net.au/classic/keys/stories/s2421945.htm 

If you're reading this later, you can hear it later, using the
Internet facilities provided on the ABC's website.  (About 4 weeks'
programs are kept):

http://www.abc.net.au/classic/keys/default.htm#listen