Hi Diki,
I think as far as Yamaha goes, a few of us were a bit bemused with the sx series, in the way they categorised some of the styles ie no actual Country section for instance , they were mixed in with other categories. In the earlier model I had, it was a bit more straight forward. Still on the whole the sx900 is a brilliant keyboard, so no complaints .
( still, it couldn’t have been a player that sorted what styles went into which catergory. Haha)