Question: what is one flat in the key signature
Answer: Major key Number of flats Flat notes Minor key Enharmonic equivalent C major 0 A minor None F major B ♭ D minor None B ♭ major B ♭ , E ♭ G minor None E ♭ major B ♭ , E ♭ , A ♭ C minor None A ♭ major B ♭ , E ♭ , A ♭ , D ♭ F minor None D ♭ major 5 B ♭ , E ♭ , A ♭ , D ♭ , G ♭ B ♭ minor C ♯ major / A ♯ minor G ♭ major 6 B ♭ , E ♭ , A ♭ , D ♭ , G ♭ , C ♭ E ♭ minor F ♯ major / D ♯ minor C ♭ major 7 B ♭ , E ♭ , A ♭ , D ♭ , G ♭ , C ♭ , F ♭ A ♭ minor B major / G ♯ minor