C7+9 (C7#9) altered chord
Altered C chord for piano presented by keyboard diagrams.
Explanation: The C7+9 alter the C9 by the change of one note. The chord name can also be written as C7#9 or C7(#9).
Theory: The C7+9 are identical with the C9 except that the major ninth is sharpenedThe tone is one half step higher.
Notes: C - E - G - Bb - D#