I don't write on sheet music. Any song I want to try, if it's in paper form, gets scanned and saved as a pdf. Then I read it on a Dell 24 inch screen that is rotatable, so I can occasionally get the entire page on screen. But usually, I work in wide screen, showing three or four lines at a time. Everything I play is from memory, and even that is subject to on-the-fly arranging, and rearranging. The only time I actually refer to sheet music is when I learning a tune, or if I forgot how a part went. If I had paper versions of all of the sheet music and music books I have, there wouldn't be room for the piano, even as a digital, nor room for me to sit and play it.