Lesson Book 1 is pre-reading. Concepts taught are: How to sit at the piano; Correct hand position; High and low; Loud and soft (forte and piano); Keyboard topography; Bar line and measure, Quarter, half, whole notes and rests; and Repeat signs. The first pieces in the book are played on the black keys. Later in the book, C D E for the RH and C B A for the LH (Middle C position) are taught with letter notes (the name of the note is written inside the note head).
The music from this book is available in the Piano Maestro app that's downloadable at http://app.appsflyer.com/id604699751?pid=web&c=alfred. Learn more About JoyTunes, the maker of Piano Maestro at http://teachers.joytunes.com/?jt&utm_source=alfred&utm_campaign=web.