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 flattenedThe tone is one half step lower.