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3.1.4 On the un-nestedness of brackets and ties

You have already met a number of different types of bracket and bracket-like constructs in writing the input file to LilyPond. These obey different rules which can be confusing at first. Let’s first review the different types of brackets and bracket-like constructs.

Bracket Type	Function
{ .. }	Encloses a sequential segment of music
< .. >	Encloses the notes of a chord
<< .. >>	Encloses simultaneous music expressions
( .. )	Marks the start and end of a slur
\( .. \)	Marks the start and end of a phrasing slur
[ .. ]	Marks the start and end of a manual beam

To these we should add other constructs which generate lines between or across notes: ties (marked by a tilde, ~), tuplets written as \times x/y {..}, and grace notes written as \grace{..}.

Outside LilyPond, the conventional use of brackets requires the different types to be properly nested, like this, << [ { ( .. ) } ] >>, with the closing brackets being encountered in exactly the opposite order to the opening brackets. This is a requirement for the three types of bracket described by the word ‘Encloses’ in the table above – they must nest properly. However, the remaining bracket-like constructs, described with the word ‘Marks’ in the table above together with ties and tuplets, do not have to nest properly with any of the brackets or bracket-like constructs. In fact, these are not brackets in the sense that they enclose something – they are simply markers to indicate where something starts and ends.

So, for example, a phrasing slur can start before a manually inserted beam and end before the end of the beam – not very musical, perhaps, but possible:

\relative { g'8\( a b[ c b\) a] g4 }

In general, different kinds of brackets, bracket-like constructs, and those implied by tuplets, ties and grace notes, may be mixed freely. This example shows a beam extending into a tuplet (line 1), a slur extending into a tuplet (line 2), a beam and a slur extending into a tuplet, a tie crossing two tuplets, and a phrasing slur extending out of a tuplet (lines 3 and 4).

\relative {
  r16[ g' \tuplet 3/2 { r16 e'8] }
  g,16( a \tuplet 3/2 { b16 d) e }
  g,8[( a \tuplet 3/2 { b8 d) e~] } |
  \tuplet 5/4 { e32\( a, b d e } a4.\)
}

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LilyPond – Beginnershandleiding v2.21.0 (ontwikkelingstak).