Long before the lines and spaces, the flags and beams, music had to be memorized because there was no way to write it down. That is, until clever Guido came along. Learn how this medieval monk laid the groundwork for the system of music notation that we use today. This true story is told with beautiful illustrations and age-appropriate vocabulary, which can be read from the screen and heard each time you turn a page. Embedded audio plays period music, whimsical sound effects, and a professionally voiced narration.