Dear friends, I feel like an intruder since unfortunately I am no pianist. I hope I'll get a free pass from you for adoring the piano and having a tiny obsession for Franz Liszt. I am searching for a present to buy to a friend who has helped me enormously on piano issues for my novel, but refused to accept any payment for the hard work he put into the project. He is a professor at our Music Academy (in Montenegro, former Yugoslavia) and loves to read. Is there a book (better if pricey) that every pianist should love to own, either on music history, or technique, or any other aspect of piano playing? Thanks!