+compress_music_list (SCM l, Moment m)
+{
+ for (SCM s = l; scm_is_pair (s); s = scm_cdr (s))
+ unsmob_music (scm_car (s))->compress (m);
+}
+
+Moment
+Music_sequence::minimum_start (SCM l)
+{
+ Moment m;
+
+ for (SCM s = l; scm_is_pair (s); s = scm_cdr (s))
+ m = min (m, unsmob_music (scm_car (s))->start_mom ());
+ return m;
+}
+
+Moment
+Music_sequence::first_start (SCM l)
+{
+
+ for (SCM s = l; scm_is_pair (s); s = scm_cdr (s))
+ {
+ Music *mus = unsmob_music (scm_car (s));
+ Moment start = mus->start_mom ();
+ if (mus->get_length ().to_bool () || start.to_bool ())
+ return start;
+ }
+ return Moment ();
+}
+
+MAKE_SCHEME_CALLBACK (Music_sequence, simultaneous_relative_callback, 2);
+SCM
+Music_sequence::simultaneous_relative_callback (SCM music, SCM pitch)
+{
+ Music *me = unsmob_music (music);
+ Pitch p = *unsmob_pitch (pitch);
+
+ SCM elts = me->get_property ("elements");
+ SCM copied = SCM_EOL;
+ if (lily_1_8_relative)
+ copied = ly_music_deep_copy (elts);
+
+ Pitch retval = music_list_to_relative (elts, p, false);
+
+ if (lily_1_8_relative)
+ {
+
+ Pitch retval_1_8 = music_list_to_relative (copied, p, true);
+ if (retval_1_8 != retval)
+ lily_1_8_compatibility_used = true;
+
+ retval = retval_1_8;
+ }
+
+ return retval.smobbed_copy ();
+}
+
+MAKE_SCHEME_CALLBACK (Music_sequence, event_chord_relative_callback, 2);
+SCM
+Music_sequence::event_chord_relative_callback (SCM music, SCM pitch)