Does a piano roll sound different (I assume it does)? Ie, is or was there a specific market for a CD of a piano roll specifically, not, of someone playing the piano?
In terms of the music being played, piano rolls can be different from "normal piano music" because it's not played live by a real human, so it can have complex parts with full chords, additional voices, all with perfect rhythm and no wrong notes. This can be very compelling when well executed on the right songs (and it can also sound "mechanical" on others).
There isn't a huge market for piano roll recordings, and these recordings are rare. It's a niche topic that can attract
- Older people who have known the time piano rolls (say, until the 1950s)
- People nostagic of old times in general (in particular the 1910s-1940s), the age of early jazz with stride piano and early Broadway.
- Music scholars, because some of these rolls are of historical/musical importance, in particular those "recorded" by George Gershwin or Fats Waller and other big names. A lot of material exists only as piano rolls.
For the example of the Gershwin CD I posted above, it was produced by musicologist Artis Wodehouse [1] in parnership with the yamaha disklavier pianos iirc [2], so my guess is this was a passion project above all, with a bit of Yamaha marketing.
