Blues music characteristically used blue notes altered 3rd 5th and 7th is the true statement.
The lowered third, fifth, and seventh scale degrees are typically referred to as the blue notes. The elevated fourth is another name for the dropped fifth. C major scale: C, D, E, F, G, A, B. C blues scale: C, E-flat, F, F-sharp, G, B-flat are the example of blue note.
Thus, it is a true statement.
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