Part Four has the student playing fun, musical pieces at the early intermediate level. New keys include E, B, Ab, Db, and Gb Major with one-page worksheets to support their understanding. New concepts include ledger lines above the bass and below the treble staves, left hand melody, dotted quarter notes and finger changes on the same key. A chart of new one octave scales and chords (Ab, Db, Gb, E, B, F#, C# Major) is provided at the end as well as a glossary of musical terms and expression marks.