You should also have Artist Performance Sets.

http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=352456#Post352456

Originally Posted By: Andrew - PG Music
The instrumental Studies are songs with artist performances. They are a great way to learn, as they feature common chord progressions in a variety of styles, and include complete and accurate notation and tab.

The one you selected is a solo-accompaniment piano, which is why the other tracks are disabled in the song. The performance is saved on the Melody track (indicated by the orange track colour), and is fully transcribed there. You can enable the other tracks if you wish, by right-clicking on the track and clicking on the menu item "xxxx track is disabled". You could also select a different Style.

The comments for each of the studies are on the Song Memo...

"This instrumental study focuses on solo-accompaniment acoustic piano in the Pop Ballad style. Learning this type of accompaniment is very beneficial and can be applied to many different styles of music. The player uses a simple eighth note rhythm, filling in the eighth note segments in a syncopated fashion, mixing left and right hand playing. You can view the notes on the big piano for a simple and quick way to follow along. This particular song is in the key of F and has frequent chord changes, often occuring every 2 or 4 beats. The chords in the progression are very common in pop music: I, IV, V, and VIm."