Disklavier

Hi And Greetings from UK! I would really like some help, with my 
friends over "The pond"! (U.S.A)! I would like to buy a QRS cd piano 
with backings disc! I really want to know if these play on our 
Yamaha Disklavier. I have sent e-mails (4 in fact over the 
year ..... Business must be good as they can't answer them!!!) and 
then I have phoned them and to be honest .. I did not get a person 
who did not know much etc on the line! So Please, Please could some 
kind person give me the lowdown on these disks! I would really like 
to know..before I part with my money .. and I know that if it did 
not work, I would not be able to get my money back! Thanking you in 
advance!
Kind regards
Stephen Bennett
P.S I have bought loads of QRS "floppy disc" and I know that they 
are ok!