bapu
There is only one piano IIIRC in EZKeys. However there are "presets" to alter that piano flavor.
As a base product you need the EZ Keys that comes with either a Grand Piano or Upright piano sound, and a chunk of midi files in different styles.
In addition to that you can buy:
* Upright or grand Piano Sound expansion
* Pop/Rock midi files (works only with EZ Keys but midi files can be dragged from the VSTi to your normal DAW to be used with another VSTi if needed)
* Gospel Midi files (as above)
* Blues Midi files (as above)