The key that has six sharps is F-sharp major. In music theory, the key of F-sharp major is characterized by having six sharps in its key signature. These sharps are F#, C#, G#, D#, A#, and E#.
When playing in F-sharp major, all these notes are raised by a half step. This key is often used in classical music and can create a bright and uplifting sound. It’s important to be familiar with the key signatures to understand the tonality and harmony of a piece of music.