diff --git a/.codecov.yml b/.codecov.yml
index 61b01ca48..d5abcd73f 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -2,4 +2,4 @@ coverage:
   status:
     patch: false
 
-comment: off
\ No newline at end of file
+comment: off
diff --git a/.flake8 b/.flake8
new file mode 100644
index 000000000..d674beb1f
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,6 @@
+[flake8]
+ignore = E203,W503,Q000
+max-line-length = 80
+per-file-ignores =
+    */__init__.py: F401
+    tests/***.py: F405
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 000000000..f65dbfc4e
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,27 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:  # for a list of hooks see https://github.com/pre-commit/pre-commit-hooks
+      - id: check-added-large-files
+        args: ['--maxkb=100']
+      - id: check-case-conflict
+      - id: check-executables-have-shebangs
+      - id: check-json
+      - id: check-shebang-scripts-are-executable
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-yaml
+      - id: destroyed-symlinks
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: file-contents-sorter
+      - id: mixed-line-ending
+      - id: no-commit-to-branch
+      - id: pretty-format-json
+      - id: requirements-txt-fixer
+      - id: sort-simple-yaml
+      - id: trailing-whitespace
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8
diff --git a/bin/KeyRecognition b/bin/KeyRecognition
index 885b8a247..fb1fcdad5 100755
--- a/bin/KeyRecognition
+++ b/bin/KeyRecognition
@@ -24,7 +24,7 @@ def main():
 
     Filip Korzeniowski and Gerhard Widmer,
     "Genre-Agnostic Key Classification with Convolutional Neural Networks",
-    In Proceedings of the 19th International Society for Music Information 
+    In Proceedings of the 19th International Society for Music Information
     Retrieval Conference (ISMIR), Paris, France, 2018.
 
     This program can be run in 'single' file mode to process a single audio
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6330f244a..046e39e3b 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
 # fake requirements for readthedocs
 cython
-numpydoc
 mido
+numpydoc
diff --git a/requirements.txt b/requirements.txt
index 9fe2a6e33..e0a5414ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy>=1.13.4
-scipy>=0.16
 cython>=0.25
 mido>=1.2.6
+numpy>=1.13.4
+scipy>=0.16
diff --git a/tests/data/annotations/dummy.chords b/tests/data/annotations/dummy.chords
index aa4b40daa..2eb18f7c0 100644
--- a/tests/data/annotations/dummy.chords
+++ b/tests/data/annotations/dummy.chords
@@ -1,4 +1,4 @@
 0.1 1.0 A:min
 1.0 2.0 F:maj
 2.0 3.0 C:maj
-3.0 4.0 G:maj
\ No newline at end of file
+3.0 4.0 G:maj
diff --git a/tests/data/annotations/dummy.key b/tests/data/annotations/dummy.key
index c5d486a43..cef3d41f8 100644
--- a/tests/data/annotations/dummy.key
+++ b/tests/data/annotations/dummy.key
@@ -1 +1 @@
-F# minor
\ No newline at end of file
+F# minor
diff --git a/tests/data/detections/dummy.chords.txt b/tests/data/detections/dummy.chords.txt
index 4bf609493..ca1900a49 100644
--- a/tests/data/detections/dummy.chords.txt
+++ b/tests/data/detections/dummy.chords.txt
@@ -6,4 +6,4 @@
 2.2 2.9 C:maj/3
 2.9 3.5 G:maj7/7
 3.5 4.1 G:aug
-4.1 4.3 N
\ No newline at end of file
+4.1 4.3 N
diff --git a/tests/data/detections/dummy.key.txt b/tests/data/detections/dummy.key.txt
index 689085649..52cf6f3a3 100644
--- a/tests/data/detections/dummy.key.txt
+++ b/tests/data/detections/dummy.key.txt
@@ -1 +1 @@
-a maj
\ No newline at end of file
+a maj
diff --git a/tests/data/detections/sample.key_recognition.txt b/tests/data/detections/sample.key_recognition.txt
index 4e5f337ce..d2da55a8f 100644
--- a/tests/data/detections/sample.key_recognition.txt
+++ b/tests/data/detections/sample.key_recognition.txt
@@ -1 +1 @@
-Ab major
\ No newline at end of file
+Ab major
diff --git a/tests/data/detections/sample2.key_recognition.txt b/tests/data/detections/sample2.key_recognition.txt
index 56a7832e2..0e41a14fe 100644
--- a/tests/data/detections/sample2.key_recognition.txt
+++ b/tests/data/detections/sample2.key_recognition.txt
@@ -1 +1 @@
-A minor
\ No newline at end of file
+A minor