Fixed layout PDF, file size about 170 MB. Advantages over print book: no shipping cost, color photos you can magnify to examine, and text you can magnify to larger print if 10-point text is too small for you. Easy to carry around. Caveat: for the notation you need a large screen. See the first FAQ below. The comparison photo (click on tiny image below green book cover), shows the size of full sheet of music on a 9.7-inch/24.5 cm iPad (measured diagonally), a 13-inch laptop screen, and the printed page. For my eyes, the music on both these screens is too small to read easily. Instead, I recommend a large monitor, or an 11- to 13-inch tablet, for readability. You can also print out the longer tunes as needed.