Music Pathways is one of the most widely used and respected courses for piano students. Levels 1-5 each have sets of books that focus on specific learning goals. Supplementary solos are also available for each level.

Practice Guides
Style: Same subject, different styles
Style: Time Line
Style: Style comparison
Rhythm: Rhythmic memory
Rhythm: Syncopation
Melody: Canons
Melody: Skip and step motion
Melody: Melodic organization
Melody: Contemporary tone arrangement
Harmony: Harmony review
Harmony: Chord analysis
Harmony: The vi chord
Harmony: Harmony exploration
Harmony: Varying 6th and 10th accompaniment
Harmony: Complete V7 chords/Secondaary V7's
Harmony: Related keys, Circle of 5ths
Form: Design in freestyle music
Form: Large and small form
Form: Sonatina analysis
Form: Classical balance
Expressive Elements: Matching colors
Exploring: Style comparison - Old and Modern