| Invention No. | Key | Difficulty for duet | |---------------|------|----------------------| | No. 1 (BWV 772) | C | Easy-medium | | No. 8 (BWV 779) | F | Medium | | No. 13 (BWV 784) | A min | Medium-hard |
| Invention No. | Key | Difficulty for duet | |---------------|------|----------------------| | No. 1 (BWV 772) | C | Easy-medium | | No. 8 (BWV 779) | F | Medium | | No. 13 (BWV 784) | A min | Medium-hard |
