the definitoion of "bass" in music terms, are the notes that have a low tone, or low frequency of some sort. Typically, the range for bass is from C0 to middle C4. As for instruments that create bass notes, it goes from C2 to C4.
In chorus, bass can also be used to define a male, that has lower pitch areas and cannot reach high notes that males that identify as tenors can reach/.
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