Duval 23 Keys.

Duval 23 Keys. Duval 23 Keys Duval 23 Keys; www.23keys.com; duval@23keys.com. 23 Keys is a brand new piano course geared towards developingfluent and accurate sight reading. It combines a revolutionarynote-learning program based on the 23 notes of the full Grand Staff withinnovative and effective ways of introducing and reinforcing the basicconcepts needed to build secure sight-reading skills. 23 Keys consists of four carefully graded course booksincorporating 23 levels, through which pupils are able to move at theirown pace. Each piano book is accompanied by the complementary MP3download, Let's Practice!, a real-time audio trainer.