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A filled band spanning every pitch in a range.
Also known as: Cluster notation, Pitch band notation
A tone cluster is written as a filled or outlined band spanning a range of the staff, calling for every pitch within it to sound at once rather than a set of named notes.
A thick vertical band spanning several staff lines, filled or outlined, with noteheads marking its upper and lower limits.
A fuller structured visual breakdown is not yet documented for this symbol.