#### 3.16.1 Clusters

A cluster indicates a continuous range of pitches to be played. They can be denoted as the envelope of a set of notes. They are entered by applying the function `notes-to-clusters` to a sequence of chords, e.g.

>          \apply #notes-to-clusters {  <c e > <b f'>  }

The following example (from input/regression/cluster.ly) shows what the result looks like

Ordinary notes and clusters can be put together in the same staff, even simultaneously. In such a case no attempt is made to automatically avoid collisions between ordinary notes and clusters.

##### See also

Program reference: ClusterSpanner, ClusterSpannerBeacon, Cluster_spanner_engraver, and ClusterNoteEvent.

Examples: input/regression/cluster.ly.

##### Bugs

Music expressions like `<< { g8 e8 } a4 >>` are not printed accurately. Use `<g a>8 <e a>8` instead.

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