+**Bb9** denotes a B-[flat](/wiki/Flat) [ninth](/wiki/Ninth) chord, built upon the root note B♭. It adds a vibrant tension, often enriching harmonies in jazz and other genres. This extended chord typically includes the root, third, fifth, seventh, and ninth intervals.
+## See also
+- [Music Theory](/wiki/Music_Theory)
+- [Harmony](/wiki/Harmony)
+- [Chord](/wiki/Chord)
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