"Dynamic line spanner"
'(avoid-slur))
+(ly:add-interface
+ 'dynamic-text-spanner-interface
+ "Dynamic text spanner"
+ '(text))
+
(ly:add-interface
'finger-interface
"A fingering instruction"
"An interface for any notes set in a tablature staff"
'())
+(ly:add-interface
+ 'unbreakable-spanner-interface
+ "A spanner that should not be broken across line breaks. Override
+with @code{breakable=##t}. "
+
+ '(breakable))
+
(ly:add-interface
'vertically-spaceable-interface
"Objects that should be kept at constant vertical distances. Typically: