The home base could be described as a central or middle ground around which other musical notes may be measured. The quarter note is adopted as the home base because it stands at a central position relative to other notes.
The quarter note refers to a quarter or simply one-fourth of a whole note, hence, beyond the quarter note, we have the half and the whole notes.
Similary, below the quarter note, we have the one-eight and one-sixteen notes which are of shorter length
Therefore, the quarter note stays fairly central to other musical notes both above and below its position.
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