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+History handling
+================
+
+For correct logical handling of ``previous()`` and ``previous_track`` backends
+will need to keep track of which songs they have played.
+
+Normal playback
+----------------
+
+Each time a new song is played the previous ``current_track`` should be added to
+the history. The ``previous_track`` should always be the most recent history item.
+
+Playback with repeat enabled
+-----------------------------
+
+History should be handled in same manner as regular playback. ``next_track``
+at end of playlist should loop to first item on playlist.
+
+Playback with random enabled
+-----------------------------
+
+Each song should only be played once until entire playlist has been played,
+once this has occurred a new random order should be played. History should be
+handled in the same way as regular playback.
+
+A suggested implementation is creating a shuffled copy of the tracks and
+retrieving ``next_track`` from here until it is empty.
+
+Playback with consume enabled
+-----------------------------
+
+Turning on consume should set history to an empty array, and not add any new
+tracks while it is on. ``previous_track`` should return ``current_track`` to
+match MPD behaviour.
+
+Playback with repeat and random
+-------------------------------
+
+Once the shuffled tracks array is empty it should be replaced with a new
+shuffled array of tracks.
+
+Playback with repeat and consume
+--------------------------------
+
+Return ``current_track`` for ``previous_track`` to match MPD.
+
+Playback with random and consume
+--------------------------------
+
+Return ``current_track`` for ``previous_track`` to match MPD.
+
+Playback with repeat, random and consume
+----------------------------------------
+
+Return ``current_track`` for ``previous_track`` to match MPD.