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edits
Changes
m
→Dominant Seventh
R M3 P5 m7
-M3- -m3- '''-m3-'''
----P5----
'''----d5----''' '''-------m7-------'''
Notice the d5, extra m3, and m7 intervals the 7th introduces. This has a huge impact in the overall dissonance of the chord, adding to its dominant function as the V7 chord.