+#include "context.hh"
+#include "dispatcher.hh"
+#include "duration.hh"
+#include "input.hh"
+#include "international.hh"
+#include "ly-smobs.icc"
+#include "main.hh"
+#include "music-sequence.hh"
+#include "score.hh"
+#include "warn.hh"
+
+/*
+ Music is anything that has (possibly zero) duration and supports
+ both time compression and transposition.
+
+ In Lily, everything that can be thought to have a length and a pitch
+ (which has a duration which can be transposed) is considered "music".
+*/
+bool
+Music::internal_is_music_type (SCM k) const
+{
+ SCM ifs = get_property ("types");
+
+ return scm_c_memq (k, ifs) != SCM_BOOL_F;
+}
+
+Music::Music (SCM init)
+ : Prob (ly_symbol2scm ("Music"), init)
+{
+ length_callback_ = SCM_EOL;
+ start_callback_ = SCM_EOL;
+
+ length_callback_ = get_property ("length-callback");
+ if (!ly_is_procedure (length_callback_))
+ length_callback_ = duration_length_callback_proc;
+
+ start_callback_ = get_property ("start-callback");
+}
+
+void
+Music::derived_mark () const
+{
+ scm_gc_mark (length_callback_);
+ scm_gc_mark (start_callback_);
+}
+
+SCM
+Music::copy_mutable_properties () const
+{
+ return ly_music_deep_copy (mutable_property_alist_);
+}
+
+void
+Music::type_check_assignment (SCM s, SCM v) const
+{
+ ::type_check_assignment (s, v, ly_symbol2scm ("music-type?"));
+}
+
+Music::Music (Music const &m)
+ : Prob (m)
+{
+ length_callback_ = m.length_callback_;
+ start_callback_ = m.start_callback_;
+
+ /// why?
+ set_spot (*m.origin ());
+}
+
+Moment
+Music::get_length () const
+{
+ SCM lst = get_property ("length");
+ if (unsmob_moment (lst))
+ return *unsmob_moment (lst);
+
+ if (ly_is_procedure (length_callback_))
+ {
+ SCM res = scm_call_1 (length_callback_, self_scm ());
+ return *unsmob_moment (res);
+ }
+
+ return Moment (0);
+}
+
+Moment
+Music::start_mom () const
+{
+ SCM lst = start_callback_;
+ if (ly_is_procedure (lst))
+ {
+ SCM res = scm_call_1 (lst, self_scm ());
+ return *unsmob_moment (res);
+ }
+
+ Moment m;
+ return m;
+}
+
+void
+print_alist (SCM a, SCM port)
+{
+ /* SCM_EOL -> catch malformed lists. */
+ for (SCM s = a; scm_is_pair (s); s = scm_cdr (s))
+ {
+ scm_display (scm_caar (s), port);
+ scm_puts (" = ", port);
+ scm_write (scm_cdar (s), port);
+ scm_puts ("\n", port);
+ }
+}
+
+
+Pitch
+Music::generic_to_relative_octave (Pitch last)
+{
+ SCM elt = get_property ("element");
+ Pitch *old_pit = unsmob_pitch (get_property ("pitch"));
+ if (old_pit)
+ {
+ Pitch new_pit = *old_pit;
+ new_pit = new_pit.to_relative_octave (last);
+
+ SCM check = get_property ("absolute-octave");
+ if (scm_is_number (check)
+ && new_pit.get_octave () != scm_to_int (check))
+ {
+ Pitch expected_pit (scm_to_int (check),
+ new_pit.get_notename (),
+ new_pit.get_alteration ());
+ origin ()->warning (_f ("octave check failed; expected \"%s\", found: \"%s\"",
+ expected_pit.to_string (),
+ new_pit.to_string ()));
+ new_pit = expected_pit;
+ }
+
+ set_property ("pitch", new_pit.smobbed_copy ());
+
+ last = new_pit;
+ }
+
+ if (Music *m = unsmob_music (elt))
+ last = m->to_relative_octave (last);
+
+ last = music_list_to_relative (get_property ("elements"), last, false);
+ return last;
+}
+
+Pitch
+Music::to_relative_octave (Pitch last)