If you are learning to play the piano or keyboard you will greatly benefit from the regular practice of musical scales and arpeggios. Intended for beginners, this practice will help to instill in you the principles of good playing technique, as well as helping to establish a good knowledge of the Western key system. Learning to play scales and arpeggios within all of the different keys that are available to you will also help to familiarize you with all of the individual keys and the ranges of notes they employ. If you compose, improvise or produce your own music, this is vital knowledge that will provide a good foundation for the composer's art of harmony. This manual includes: major scales in all twelve keys, harmonic minor scales in all twelve keys, melodic minor scales in all twelve keys, the chromatic scale, arpeggios in all twelve major and minor keys and an extensive theory section explaining musical scales and the key system.