How many flats are in the key signature of G-flat Major?

The key signature of G-flat Major contains six flats. In Western music theory, the major keys typically follow a specific pattern regarding their key signatures. The key signature for G-flat Major consists of B-flat, E-flat, A-flat, D-flat, G-flat, and C-flat.

To understand this, one can refer to the circle of fifths, which illustrates the relationship between different keys and their signatures. G-flat Major is situated six semitones down from B Major, which has five sharps; therefore, G-flat Major would logically correspondingly have six flats in its key signature.

In summary, G-flat Major's key is characterized by the accumulation of six flats, which correctly represents its unique sound and functional harmonic structure.