The C minor seventh chord is a four-note chord that consists of the root note C, the minor third E♭, the perfect fifth G, and the minor seventh B♭. This chord is often used in various music genres, including jazz, blues, and classical, to create a rich, emotional sound. In music notation, the C minor seventh chord is typically represented as Cm7. It can be played on various instruments, such as the piano and guitar, and is commonly found in chord progressions, adding depth and complexity to the harmony.