--"Silver Bell" was a ragtime song, written in 1910 by Percy Wenrich, who also wrote, "On Moonlight Bay". There were several popular recordings, and it undoubtable sold a lot of sheet music(we tend to forget that the big money used to be in sheet music, and the records were used to market sheet music)--so it was a tune that entered the repertoire from the pop realm--Which kind of reinforces the idea that "Old Time" is a catchall--