1\version "2.19.21"
2\header {
3  texidoc = "Beam collision can be tweaked to only apply to the grobs
4within the beam's original voice."
5}
6
7\relative {
8  \time 5/4
9  << { c'8[ s c ] } \\ { s8 c' s8 } >>
10  c,[ des' ]
11  \override Staff.Beam.collision-voice-only = ##t
12  << { c,8[ s c ] } \\ { s8 c' s8 } >>
13  c,[ des'! ]
14}
15