[ Ref. Dennis Steckley in 21.11.08 MMD ]

There is a smallish collection of nickelodeon Style "A" rolls on
Terry Smythe's Archive. The files are limited to pre-1930 public
domain music, of course. Go to http://www.terrysmythe.ca/archive.htm 
then click on the link below and downloading of a zip file will start.

http://www.terrysmythe.ca/A-Rolls.zip 
> Nickelodeon (A-Rolls) non-expression A-Roll
> nickelodeon roll midi files - 210 files, 3.8 megs

Wallace Venable