+ "A stanza number, to be put in from of a lyrics line."
+ '())
+
+(ly:add-interface
+ 'string-number-interface
+ "A string number instruction."
+ '())
+
+(ly:add-interface
+ 'stroke-finger-interface
+ "A right hand finger instruction."
+ '(digit-names))
+
+(ly:add-interface
+ 'system-start-text-interface
+ "A text at the beginning of a system."
+ '(text long-text collapse-height style))