31. The trio has a part similar to the second third with a chromatic scale like sound. 32. The most common conception of the chromatic scale before the 13th century was the Pythagorean chromatic scale. 33. Descending chromatic scales both add to this atmosphere and maintain the dark overall tone which has pervaded. 34. Again, this implies that the notes are drawn from a chromatic scale tuned with 12-tone equal temperament. 35. The bells produce two intertwined pentatonic scales three tones apart with additional pitches completing the chromatic scale . 36. It can be seen that only two notes of the chromatic scale , C and D, are missing. 37. The term " Non-Pythagorean " is a reference to the Pythagorean tuning approximated by the chromatic scale . 38. The interlocking octaves were meant to be played at the same speed as the original chromatic scale . 39. The roughest interval in the chromatic scale is the minor second and its inversion the major seventh. 40. Hindemith used the planetary system as a metaphor for his own musical arrangement of the chromatic scale .
