The method of use of this instrument that could be defined as "musician's record", is completely innovative, easy to use and according to a mathematical-geometric vision of music and specifically of melody and the harmony. It contains a large amount of information that is accessed quickly and easily. Through DAMA you will not only be able to obtain information in a direct way (transport of chords, melodies, obtaining tonalities, formation of chords, etc.). You can also understand in a simple vis