(Willis). The classic and beloved Modern Course series provides a clear and complete foundation in the study of the piano that enables the student to think and feel musically. Follows uninterruptedly and in progressive sequence the musical foundation developed in Grade 1. This version includes audio files online The audio is accessed online using the unique code inside each 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.