The cost of the best bassoon sheet music to learn with shouldn't be that much. When you start as a musician, you only need one or two beginner books, and these range between $15 and $40 depending on how big the book is and how many lessons it includes. Some beginner books are meant to have everything you need to get started, including warm-ups and scale exercises, lessons, and sheet music. If it comes with an accompanying CD or audio files, it might cost more. As you progress in your skill, you'll end up spending less on comprehensive books because they don't include all of those extra lessons but rather just the sheet music.