These are all someone's transcriptions for pianola of tunes by Gershwin (it's certainly not a solo pianist, and it sounds too well synchronised for two of them). That sort of thing was done very often in the heyday of the pianola. Not having listened very carefully, and being lamentably unaware of a lot of Gershwin's music (I know quite a few tunes but there are _hundreds_ more cracking ones out there), I reckon these are all medleys, perhaps each from a different show. Unfortunately the first person I would like to ask about these died a couple of years ago :-(
Marvellous stuff, anyway, thanks for uploading it! The third piece I think especially fine as a bit of transcription and pianola playing.