What is the number of flats in the Bb Major scale?

The Bb Major scale consists of two flats. This scale is built on the notes Bb, C, D, Eb, F, G, and A. The presence of flats is determined by the key signature associated with the scale. The first flat in the Bb Major scale is Bb itself, and the second flat is Eb.

Understanding the key signature is crucial for reading and performing music in the key of Bb Major. The key signature for Bb Major is found on the staff at the beginning of a musical piece and indicates which notes are to be played flat throughout the piece. This feature directly affects how the music is interpreted, allowing musicians to maintain the intended harmony and melodic structure.

While the other answer choices present different numbers of flats or no flats at all, they do not accurately represent the Bb Major scale's key signature, which specifically includes those two flats. Thus, the correct answer highlights the importance of knowing the flats in relation to scale construction in Western music theory.