: Professional piano books are often 9x12 inches , slightly larger than standard letter paper to allow for easier reading. Heavier paper prevents "ghosting" (seeing the music on the back of the page).
: Books containing arrangements of modern hits, movie soundtracks, or jazz standards.
Developing a "solid paper" on buying piano music books involves more than just a list of stores; it requires understanding the types of books available, where to source them based on your skill level, and what physical characteristics to look for. 1. Types of Piano Music Books