diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 32bf2bb..9576cfa 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -10,8 +10,9 @@ v3.1.0 (UNRELEASED)
 - Add ``.cue`` to the list of excluded file extensions. (PR: #29)
 - Replace ``os.path`` usage with ``pathlib`` to handle arbitrary file path
   encodings better. (#20, PR: #30)
+- Add an ``included_files_extensions`` config. (#8, PR: #32)
 
-
+  
 v3.0.0 (2019-12-22)
 ===================
 
diff --git a/README.rst b/README.rst
index 6adafaa..e32fe4d 100644
--- a/README.rst
+++ b/README.rst
@@ -91,9 +91,16 @@ The following configuration values are available:
   library it should try and store its progress so far. Some libraries might not
   respect this setting. Set this to zero to disable flushing.
 
+- ``local/included_file_extensions``: File extensions to include when scanning
+  the media directory. Values should be separated by either comma or newline.
+  Each file extension should start with a dot, .e.g. ``.flac``. Setting any
+  values here will override the existence of ``local/excluded_file_extensions``.
+
 - ``local/excluded_file_extensions``: File extensions to exclude when scanning
   the media directory. Values should be separated by either comma or newline.
-  Each file extension should start with a dot, .e.g. ``.html``.
+  Each file extension should start with a dot, .e.g. ``.html``. Defaults to a
+  list of common non-audio file extensions often found in music collections.
+  This config value has no effect if ``local/included_file_extensions`` is set.
 
 - ``local/directories``: List of top-level directory names and URIs
   for browsing.
diff --git a/mopidy_local/__init__.py b/mopidy_local/__init__.py
index d4d881a..225ecd2 100644
--- a/mopidy_local/__init__.py
+++ b/mopidy_local/__init__.py
@@ -26,6 +26,7 @@ class Extension(ext.Extension):
         schema["scan_timeout"] = config.Integer(minimum=1000, maximum=1000 * 60 * 60)
         schema["scan_flush_threshold"] = config.Integer(minimum=0)
         schema["scan_follow_symlinks"] = config.Boolean()
+        schema["included_file_extensions"] = config.List(optional=True)
         schema["excluded_file_extensions"] = config.List(optional=True)
         schema["directories"] = config.List()
         schema["timeout"] = config.Integer(optional=True, minimum=1)
diff --git a/mopidy_local/commands.py b/mopidy_local/commands.py
index 5dc213d..f195614 100644
--- a/mopidy_local/commands.py
+++ b/mopidy_local/commands.py
@@ -81,6 +81,10 @@ class ScanCommand(commands.Command):
                 media_dir=media_dir,
                 file_mtimes=file_mtimes,
                 files_in_library=files_in_library,
+                included_file_exts=[
+                    file_ext.lower()
+                    for file_ext in config["local"]["included_file_extensions"]
+                ],
                 excluded_file_exts=[
                     file_ext.lower()
                     for file_ext in config["local"]["excluded_file_extensions"]
@@ -143,19 +147,56 @@ class ScanCommand(commands.Command):
         return files_to_update, files_in_library
 
     def _find_files_to_scan(
-        self, *, media_dir, file_mtimes, files_in_library, excluded_file_exts
+        self,
+        *,
+        media_dir,
+        file_mtimes,
+        files_in_library,
+        included_file_exts,
+        excluded_file_exts,
     ):
         files_to_update = set()
 
+        def _is_hidden_file(relative_path, file_uri):
+            if any(p.startswith(".") for p in relative_path.parts):
+                logger.debug(f"Skipped {file_uri}: Hidden directory/file")
+                return True
+            else:
+                return False
+
+        def _extension_filters(
+            relative_path, file_uri, included_file_exts, excluded_file_exts
+        ):
+            if included_file_exts:
+                if relative_path.suffix.lower() in included_file_exts:
+                    logger.debug(f"Added {file_uri}: File extension on included list")
+                    return True
+                else:
+                    logger.debug(
+                        f"Skipped {file_uri}: File extension not on included list"
+                    )
+                    return False
+            else:
+                if relative_path.suffix.lower() in excluded_file_exts:
+                    logger.debug(f"Skipped {file_uri}: File extension on excluded list")
+                    return False
+                else:
+                    logger.debug(
+                        f"Included {file_uri}: File extension not on excluded list"
+                    )
+                    return True
+
         for absolute_path in file_mtimes:
             relative_path = absolute_path.relative_to(media_dir)
             file_uri = absolute_path.as_uri()
 
-            if any(p.startswith(".") for p in relative_path.parts):
-                logger.debug(f"Skipped {file_uri}: Hidden directory/file")
-            elif relative_path.suffix.lower() in excluded_file_exts:
-                logger.debug(f"Skipped {file_uri}: File extension excluded")
-            elif absolute_path not in files_in_library:
+            if (
+                not _is_hidden_file(relative_path, file_uri)
+                and _extension_filters(
+                    relative_path, file_uri, included_file_exts, excluded_file_exts
+                )
+                and absolute_path not in files_in_library
+            ):
                 files_to_update.add(absolute_path)
 
         logger.info(f"Found {len(files_to_update)} tracks which need to be updated")
diff --git a/mopidy_local/ext.conf b/mopidy_local/ext.conf
index cbe97df..08e1f85 100644
--- a/mopidy_local/ext.conf
+++ b/mopidy_local/ext.conf
@@ -5,6 +5,7 @@ media_dir = $XDG_MUSIC_DIR
 scan_timeout = 1000
 scan_flush_threshold = 100
 scan_follow_symlinks = false
+included_file_extensions =
 excluded_file_extensions =
   .cue
   .directory
@@ -18,6 +19,7 @@ excluded_file_extensions =
   .txt
   .zip
 
+
 # top-level directories for browsing, as <name> <uri>
 directories =
     Albums                  local:directory?type=album
diff --git a/mopidy_local/library.py b/mopidy_local/library.py
index e77460e..61ae109 100644
--- a/mopidy_local/library.py
+++ b/mopidy_local/library.py
@@ -1,4 +1,3 @@
-import hashlib
 import logging
 import operator
 import sqlite3
@@ -203,9 +202,3 @@ class LocalLibraryProvider(backend.LibraryProvider):
             return [{"album": uri}]
         else:
             return []
-
-    def _model_uri(self, type, model):
-        if model.musicbrainz_id and self._config["use_%s_mbid_uri" % type]:
-            return f"local:{type}:mbid:{model.musicbrainz_id}"
-        digest = hashlib.md5(str(model)).hexdigest()
-        return f"local:{type}:md5:{digest}"
diff --git a/mopidy_local/storage.py b/mopidy_local/storage.py
index d5b28fd..a8679c3 100644
--- a/mopidy_local/storage.py
+++ b/mopidy_local/storage.py
@@ -31,10 +31,7 @@ def get_image_size_gif(data):
 
 
 def model_uri(type, model):
-    # only use valid mbids; TODO: use regex for that?
-    if model.musicbrainz_id and len(model.musicbrainz_id) == 36:
-        return f"local:{type}:mbid:{model.musicbrainz_id}"
-    elif type == "album":
+    if type == "album":
         # ignore num_tracks for multi-disc albums
         digest = hashlib.md5(str(model.replace(num_tracks=None)).encode())
     else:

diff --git a/tests/test_extension.py b/tests/test_extension.py
index e11c4a1..ff79cc2 100644
--- a/tests/test_extension.py
+++ b/tests/test_extension.py
@@ -23,6 +23,7 @@ def test_get_config_schema():
     assert "scan_timeout" in schema
     assert "scan_flush_threshold" in schema
     assert "scan_follow_symlinks" in schema
+    assert "included_file_extensions" in schema
     assert "excluded_file_extensions" in schema
     # from mopidy-local-sqlite
     assert "directories" in schema

Put back the use_album_mbid_uri option that was in local-sqlite
Using MBIDs to create uris can have unintended consequences. With local-sqlite I could switch this off but this option seems to have been removed in the new mopidy-local.

As an example, I have 2 albums that I tagged with Musicbrainz Picard.

One has 'Artist = Brian Eno'
One has 'Artist = Brian Eno & Jah Wobble'

They're also tagged with musicbrainz IDs for the artists. The second album has two artist ID tags even though it only has one artist. (This is the way Musicbrainz reccomend it is done). Since the scanner can only use one mbid to create the artist URI, both albums end up under 'Brian Eno and Jah Wobble'.

With the old local-sqlite setting use_album_mbid_uri = false in mopidy.conf fixed this.
tests/test_extension.py::test_get_config_schema
tests/test_extension.py::test_get_default_config