--- /dev/null
+\version "2.14.0"
+\header {
+ texidoc = "Beams can be allowed to collide with grobs by overriding
+the collision-interfaces property."
+}
+
+\relative c' {
+ c8 [ des' ]
+ \once \override Beam #'collision-interfaces = #'(beam-interface
+ clef-interface
+ ;inline-accidental-interface
+ key-signature-interface
+ note-head-interface
+ time-signature-interface)
+ c,8 [ des'! ]
+ c, [ \key des \major d ]
+ \once \override Beam #'collision-interfaces = #'(beam-interface
+ clef-interface
+ inline-accidental-interface
+ ;key-signature-interface
+ note-head-interface
+ time-signature-interface)
+ c [ \key c \major d ]
+ g [ \grace { a [ d ] } g, ]
+ \once \override Beam #'collision-interfaces = #'(;beam-interface
+ clef-interface
+ inline-accidental-interface
+ key-signature-interface
+ note-head-interface
+ time-signature-interface)
+ g [ \grace { a [ d ] } g, ]
+}