Amazon.com description: Product Description: Famous & Fun Christmas Duets, Book 4 contains 6 carefully selected Christmas favorites. The duets are arranged in equal parts for early intermediate pianists, and are written for one piano, four hands. For easier reading, each part is written using both treble and bass clefs, with directions for the primo to play up an octave and the secondo down an octave. Additionally, the melody often shifts between primo and secondo, creating interesting parts for both players. Book 4 features arrangements in the keys of F and D major, as well as A minor and E minor. Students are sure to enjoy their experience with these fun duets!