E7-9 (E7b9) altered chord. Altered E chord for piano presented by keyboard diagrams. Explanation: The E7-9 alter the E9 by the change of one note. The chord name can also be written as E7b9 or E7(b9). Theory: The E7-9 are identical with the E9 except that the major ninth is flattened The tone is one half step lower. E7-9 Notes: E - G# - B - D - F
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