Disklavier

I am a new user and only have a disklavier for play back use. I'm 
only now starting to download music for the first time from whatever 
sites I can find. I'm finding that often, but not always, that if I 
download songs onto a floppy disk, only the first song with play on 
the disklavier even though the rest are on the disk. Please instruct 
me on what to do, or what I didn't do already. ------Thank you