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In page Banjo:

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Two techniques closely associated with the five-string banjo are rolls and drones. Rolls are right hand accompanimental fingering patterns that consist of eight (eighth) notes that subdivide each measure.[1] Drone notes are quick little notes (typically eighth notes), usually played on the 5th (short) string to fill in around the melody notes (typically eighth notes).[2] Both rolls and drones are idiomatic to the banjo in all styles, and their sound is characteristic of bluegrass.[citation needed][3]