Comes "native" in Reason format, with adaptations of 4 patches for Reason Essentials and MainStage. These are adaptations, not originals because of sampling legal issues.
Reason Users will want Reason Pianos, and 2 patches use Abbey Road Keyboards.
However the Abbey Road Refill is hard to come by, so those patches have adaptations in the "Lite" version (included... and pretty close to the original)
Mainstage/Essentials versions have no additional requirements.