+
+ // Add listeners to all contexts except Devnull.
+ Context *contexts[] = {one, two, solo_tr, tr, 0};
+ for (int i = 0; contexts[i]; i++)
+ {
+ contexts[i]->event_source ()->add_listener (GET_LISTENER (set_busy), ly_symbol2scm ("MusicEvent"));
+ }
+
+ for (char const **p = syms; *p; p++)