(Roger Waring asks about the opening strain.  Two rolls disagree.)

I have a book of Joplin piano music that is facsimiles of sheet music.
My copy shows the B-flat.  Indeed, if you try out both versions on the
piano, by hand, in octaves, the sequence from the C# to Bb to A sounds
ominous, while the C# to B to A sounds like the A scale.  The nature of
the piece leaves no doubt of Joplin's intent.  Go for the ominous.

Could you identify the particular rolls you have?

Peter Neilson
Sanford NC

 [ Most likely the error was introduced by the original noteur, and
 [ never detected by others at the music roll company.  -- Robbie