Singers    
Singers can be divided into the following categories (although this is not the only way to group them).
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classical singers (lyric singers)
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musical theatre singers
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non-classical singers (art, pop, rock, metal, folk singers)
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singers of all or part of the above categories
 
The singers are exposed to music from:
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The sound produced from the group
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The sound produced from choir
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And The sound produced by the orchestra
 
It is important to mention that the sound produced by a soprano’s voice is about 105-110dB with a peak that could be as high as 118dB! This sound is equivalent in volume to the sound produced by an airplane turbine (not during take-off or landing).
Singers can also suffer from hearing loss or hearing disorders as well as musicians.
Impact of hearing disorders on singers
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the singer might think that his/her voice is dull
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the singer should increase the volume of the monitors to hear more clearly and this leads to greater hearing loss
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other musicians complain that the volume is too high on stage
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the singer is out of tune