Individual sheet music titles are available at MusicNotes.com, SheetMusicPlus and SheetMusicDirect.
"...The music itself is not terribly difficult, but most of the pieces would fall into a late-intermediate to early-advanced playing level. Some of the key signatures are complicated, as is some of the timing, but with some practice and attention to detail, the pieces are quite accessible. For those with smaller hands, there are a lot of reaches of more than an octave - quite a few ninths and tenths. Rolling or breaking the chords will solve those issues and there are quite a few places where the opposite hand can reach a difficult note, so keep that in mind as you play the songs. This is an exceptionally nice book and I recommend it!" ~Kathy Parsons, MainlyPiano.com