G♭, or G flat, is a musical note that is one semitone lower than G. It is commonly used in various musical scales and compositions, particularly in genres like jazz, classical, and pop. In terms of piano keys, G♭ is the black key immediately to the left of G. In the context of music theory, G♭ can also be represented as F♯ (F sharp), as they are enharmonically equivalent. This means that while they sound the same, they are notated differently depending on the musical key or context. G♭ is often found in the key signature of B major and E major.