Identify the major key that includes 2 flats.

The major key that includes 2 flats is B flat Major. This key signature consists of the notes B♭, C, D, E♭, F, G, and A. In music theory, each major key has a distinct key signature that indicates the sharps or flats in that key.

In the case of B flat Major, the key signature features two flats, specifically B flat and E flat. This is a fundamental aspect of understanding key signatures as it helps musicians identify the notes that will be used throughout a piece of music in B flat Major.

E flat Major, on the other hand, contains three flats, while A Major has three sharps, and D Major has two sharps. Recognizing these relationships between keys and their signatures is crucial for musicians when it comes to reading and performing music accurately.