The key that has 5 flats is D-flat major. In music theory, the key signature of D-flat major consists of five flats: B-flat, E-flat, A-flat, D-flat, and G-flat.
Here’s a brief explanation:
- B-flat: The first flat in the key signature.
- E-flat: The second flat.
- A-flat: The third flat.
- D-flat: The fourth flat.
- G-flat: The fifth flat.
When you see a key signature with these five flats, you know the piece is in D-flat major or its relative minor, B-flat minor.