+Scale *default_global_scale = 0;
+Protected_scm default_global_scale_scm (SCM_BOOL_F);
+
+// TODO: This is somewhat fishy: pitches protect their scale via a
+// mark_smob hook. But since pitches are of Simple_smob variety, they
+// are unknown to GUILE unless a smobbed_copy has been created. So
+// changing the default scale might cause some existing pitches to
+// lose their scale's protection.
+