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MUSICAL
A bass staff is a musical staff which opens out with a bass clef.
Bass is the bottom-most voice or instrument part. For example, string bass, or the bass voice.
Bass, as in a low male singer or a musical instrument, the plural is Basses.
Bass, as in the fish, the plural is Bass.
When referring to the musical instrument, the plural of bass is basses. When referring to the fish, the plural of bass is just bass.