The most commonly used key in club music is C minor. This key has a dark and moody feel, which is perfect for creating a sense of tension and energy on the dance floor. Many popular club tracks in various genres such as House, techno, and EDM use C minor as the key.

However, it’s important to note that there is no one “right” key for creating club music, and different genres and sub-genres may use different keys. For example, techno music may use a more minimalistic approach, using only a few elements such as a simple bassline and a repetitive drum pattern, while house music may use a wider range of chords and progressions.

In addition to key, music producers also pay attention to the tempo and rhythm of the track, which can also help create a specific mood or atmosphere.