Answer:

In tonal Western art music, when a piece tends primarily to use the pitches of a single major or minor scale, it is said to be in that major or minor key. Such pieces typically have groups of sharps or flats called key signatures. The following example has a Db-major key signature (five flats). It appears just after each clef on each staff:

Explanation:

These key signatures provide a convenient alternative to writing out all of the necessary accidentals for a given key. Instead of writing a b before every B, E, A, D, and G (as necessitated by the Db-major scale), the key signature instructs the performer that every B, E, A, D, and G on the staff are to be lowered a semitone unless otherwise noted. Compare Example 8–1 with the following, which writes out the required accidentals instead of using a key signature. Notice how much more cluttered the score appears:

Answer:

I'd ont know maybe 4 pitch