F major (D minor) has one flat which is on the B; then B-flat major (G minor) has two flats.
Playing Classical Music Measures 7-9 in B Flat (Bb).
The key of Bb has 2 flats (Bb and Eb).
The first key signature is C major, which has no sharps and no flats.
For piano, the scale names change depending on what instrument you're on, it's Db...
The musical key A-flat major, has four flats - B-flat, E-flat, A-flat, and D-flat....