Students inevitably hit small reading roadblocks when they reach the late beginning level. The Interlude book is an optional volume that can be used by students after they finish the Prelude book or in tandem with the Movement 1 book to help reinforce their reading skills and to further explore playing in easy tonal centers like G major and F major. The Interlude book has a limited amount of textual method material and includes the teacher duets all in the same book. The Interlude book also works well with transfer students who need more reading reinforcement before starting in the Movement 1 book.