Though I have never tried to do organ grinding for hire, my
Castlewood organ and I were hired by a movie company once.  I have
no idea how they found me!

Christiana Drapkin, a.k.a. "Organ Grinder Lola", and her friend,
"Master Bob", do this for a living.  They maintain a fairly full
schedule up and down the Eastern seaboard, but mostly in Maryland,
Virginia and New York City.  You can find out more information at
http://www.organgrinderlola.com/  Also, if you enter "Organ Grinder
Lola" into a Google search you can find out quite a lot of information.

To my knowledge Christiana and Master Bob are the only ones in the USA
who do organ grinding for a living.  I also believe she is the only one
to sing to the music of the organ.  She sings jazz and what are known
in German as Moritaten (sad songs with happy endings).  Her contact
information is listed on her web site.

Vincent W. Morgan, New York City