I played the F flat on the piano.

C-flat is the alternative spelling of C♭.

I played a C flat on the piano.

I love playing the piano in D flat.

D flat is the alternative spelling of D-flat.

C flat is a musical note.

I played the F flat on the piano.

I played a G flat on the piano.

D-flat is a musical note that is one semitone lower than a D.

The pianist played the F-flat note with precision.