Final answer:
Vertical and horizontal harmonic relationships are not necessarily present in texture.
Step-by-step explanation:
The statement that vertical and horizontal harmonic relationships are not necessarily present regarding texture is True.
Harmonic relationships refer to the periodic repetition of notes or sounds at specific intervals. In music, harmonies can be vertical (occurring simultaneously) or horizontal (occurring sequentially). However, when it comes to texture, these harmonic relationships are not always present.
For example, a piece of music may have a horizontal melody with non-harmonic accompaniment. The accompaniment may have different harmonic elements that do not align with the melody. In this case, the vertical and horizontal harmonic relationships are not in sync.