It's a typical Spanish instrument. It's very usual in flamenco music.
The dum box, a percussion instrument.
The guitar, a string instrument.
The guitar. a brass instrument.
It was the favourite instrument of J. S: Bach.
The organ. It's a string instrument.
The organ, A wind instrument.
The photograph is taken inside a brass instrument.
It could be...
A cello or a violin.
A viola or a harp.
A double bass or a harp.
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