Is in the key of
This is a property of type String.
- C# Major/A# minor
- F# Major/D# minor
- B Major/G# minor
- E Major/C# minor
- A Major/F# minor
- D Major/B minor
- G Major/ E minor
- C Major/A minor
- F Major/D minor
- Bb Major/G minor
- Eb Major/C minor
- Ab Major/F minor
- Db Major/Bb minor
- Gb Major/Eb minor
- Cb Major/Ab minor