Like the monumental Thesaurus of Scales and Melodic Patterns by N. Slonimsky, Intervals Scale Tones is a must have for all interested on the deep meaning and implications of pitch and sound relations. While Slonimsky does a systematic review on the overt and explicit (i.e., technical), Maria Renold goes to the core of the relations of pitch and their deep relation to the human sensibility and spirit. Deeply influenced by Rudolf Steiner, this work is a must to all that want to recover the hidden meaning of music. Maria's dissertation on the implications of pitch on the human state and, the importance of the Verdi pitch (i.e, C= 128Hz) are paramount to the present times, when humanity is loosing meaning. This work treasures important material to artists at a time when misconception about music is so prevalent, which sadly turned music to product to be sold rather than a sacrament to be shared with the universe. Real music brings people together on a higher plane.