Final answer:
The statement that a dominant seventh chord is comprised of a major triad and an added minor seventh above the root is true. This structure gives the chord a combination of stability and tension, which is characteristic of tonal harmony in Western music.
Step-by-step explanation:
True. A dominant seventh chord indeed consists of a major triad, which is a chord made up of a root note, a major third, and a perfect fifth, combined with a minor seventh above the root. This type of seventh chord is commonly used in various forms of Western music and is known for its tension and resolution characteristics, which are integral to tonal harmony. The major triad gives the chord its solid, stable sound, while the added minor seventh introduces a sense of tension, urging the chord to resolve to another chord, typically the tonic or the chord a perfect fourth above the root.