The literature is organized by difficulty, with historical information about each piece. Master composers are well-represented, as is standard literature. Includes online access to beautiful companion recordings for streaming or download of all the pieces, as well as recorded piano accompaniments. Audio is accessed online using the unique code inside the book and can be streamed or downloaded. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.