| Singular | Plural | |
|---|---|---|
| Nominativ | harmonica | harmonicae |
| Genitiv | harmonicae, harmonicai | harmonicarum, harmonicum |
| Dativ | harmonicae, harmonicai | harmonicis, harmonicabus |
| Akkusativ | harmonicam | harmonicas |
| Ablativ | harmonicad, harmonica | harmonicabus, harmonicis |
| Vokativ | harmonica | harmonicae |