Well, I found (some of) their product pages on Yamaha's website... they've all been discontinued though, so you can't buy them, but at least they have the songlist, and I'd imagine the songs are available elsewhere on the site individually. I'll dig around for those later if anyone's interested. (you'll still have to pay for them though) [edit: found most of them for Popular Classics]
KMYE official songpacks 
