135b7
Fig. 1 · C7 on the keyboard

piano chord

C7

C1E3G5B♭♭7

Major triad, minor seventh. The chord that wants to resolve a fourth up.

on guitaron ukulelethe scale

What is true of it

C7 is C, E, G and B♭ — 1, 3, 5 and b7 counted from C.

On an instrument that cannot reach all 4, the 5 goes first, in that order.

C in other shapes

Cmaj7major seventhCm7minor seventhCm(maj7)minor major seventhCmajorCmminorCdimdiminished

C♯7D♭7D7D♯7E♭7E7F7F♯7all 374