Music Master Publishing exists to publish and popularize Guitar Wheel branded inspired educational tools for teachers, students, and song writers in order to promote the understanding and enjoyment of music in both theory and practice. The Guitar Wheel is a visual two-sided music theory educational tool for guitar and piano, covering every musical key. The Guitar Wheel contains a book's worth of music theory, yet fits in your guitar case. The curved guitar neck design allows for easy visualization of theory on the guitar. Use the Guitar Wheel as a teaching tool in schools, private study, or as a song writing aid. Instructions include Spanish and German translations.