| Title | Fourth Duetto (t) |
| Short Title | Instrum Asst-2, 1807 |
| Page | 62 |
| Genre | AI |
| Country | A |
| Instruments | 2MI,B |
| Incipit | //54345//35671+5//543223 |
| Stress Notes | 535 |
| Intervals | -2,-2,2,2,-3,3,2,2,2,-4,-2,-2,-2,2, |
| Key Signature | Bb,EUb |
| Time Signature | 2/4 |
| Do | Bb |
| Date | 1807 |
| Number | A131.51 |