+/* Convert a music definition into an audio representation.
+ A baseclass. */
+class Performer : public Translator
+{
+public:
+ VIRTUAL_COPY_CONSTRUCTOR (Translator, Performer);
+ friend class Performer_group;
+ Performer_group *get_daddy_performer () const;
+ static Performer *unsmob (SCM perf) {
+ return dynamic_cast <Performer *> (Translator::unsmob (perf));
+ }
+ static bool is_smob (SCM perf) {
+ return Translator::is_smob (perf) && unsmob (perf);
+ }