D7-9 (D7b9) altered chord
Altered D chord for piano presented by keyboard diagrams.
Explanation: The D7-9 alter the D9 by the change of one note. The chord name can also be written as D7b9 or D7(b9).
Theory: The D7-9 are identical with the D9 except that the major ninth is flattenedThe tone is one half step lower.
Notes: D - F# - A - C - Eb