G# is a musical note that is one half step higher than G and one half step lower than A. It is often used in various musical scales and chords, making it an essential part of music theory. In the context of a piano, G# is the black key located immediately to the right of the G key. In terms of its role in music, G# can be found in many genres, from classical to pop. It is frequently used in G# major and G# minor scales, which help create different moods and emotions in a piece. Understanding G# can enhance your musical knowledge and performance skills.