      \fitem{make_score_map}() \emph{or} (start:numeric) \emph{or}
      (start:numeric, stop:numeric): %%
      \code{@make_score_map(a, b)} returns a map where the keys are the
      rank $i$ of the musical events and thevalue, the position (in
      beat) of the $i$th event.
      %% 
      Called with no arguments, the events considered are all
      the events in the score. With \code{start}, only the events whose
      position is greater than \code{start} are considered. If a
      \code{stop} is specified, all events must have a position between
      \code{start} and \code{stop}.


      %%% -------------------------------------------------------

