G# major is a musical key that consists of the notes G#, B#, D#, E#, and F##. It is often used in various genres of music, including classical, pop, and jazz. The key signature of G# major has sharps, making it a bright and vibrant key. In terms of its relative minor, G# major is related to E# minor. This means that both keys share the same key signature but have different tonal centers. G# major is less commonly used than some other keys, but it can create a unique sound in compositions.