C7
C7 (C Dominant 7th) is essential in blues music. It consists of C, E, G, and Bb notes.
Guitar Fretboard
Piano Keys
C
D
E
F
G
A
B
Notes: C - E - G - A#
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How to Play C7 Chord
The C7 chord is made up of the notes C, E, G, A#. On guitar, this chord uses the fingering pattern shown above, where "X" means don't play that string and "O" means play the open string.
On piano, simply press the C, E, G, A# keys simultaneously. The visual diagram above highlights exactly which keys to press.