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Among the options provided, the part that is NOT a choir part is Omezzo-baritone.
Here's a breakdown to explain:
1. Soprano: This is a high female singing voice.
2. Tenor: This is a high male singing voice.
3. Alto: This is a low female singing voice.
4. Baritone: This is a medium to low male singing voice.
5. Mezzo-baritone: This is not a standard choir part. "Mezzo" typically refers to a medium range in singing, but "mezzo-baritone" is not commonly used to describe a traditional choir part.
Therefore, "Mezzo-baritone" is the option that is NOT a typical choir part when compared to the other choices provided.
