4. Duo from Nouvelle méthode progressive pour ophicléïde
| Section of | Nouvelle méthode progressive pour ophicléïde (Schultz, Nicomède) for ophicleide or 2 ophicleides |
| Title | 4. Duo |
| Tempo markings | — |
| Metronome markings | — |
| Keys | — |
| Time signatures | — |
| Average duration (sec) | — |
| Number of measures | — |
| Code |  |
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