diff --git a/pkgs/applications/audio/seq66/default.nix b/pkgs/applications/audio/seq66/default.nix
new file mode 100644
index 000000000000..6b3a3939b43f
--- /dev/null
+++ b/pkgs/applications/audio/seq66/default.nix
@@ -0,0 +1,35 @@
+{ stdenv, fetchFromGitHub, autoreconfHook, pkg-config, qttools, which
+, alsaLib, libjack2, liblo, qtbase
+}:
+
+stdenv.mkDerivation rec {
+  pname = "seq66";
+  version = "0.90.5";
+
+  src = fetchFromGitHub {
+    owner = "ahlstromcj";
+    repo = pname;
+    rev = version;
+    sha256 = "1jvra1wzlycfpvffnqidk264zw6fyl4fsghkw5256ldk22aalmq9";
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config qttools which ];
+
+  buildInputs = [ alsaLib libjack2 liblo qtbase ];
+
+  postPatch = ''
+    for d in libseq66/include libseq66/src libsessions/include libsessions/src seq_qt5/src seq_rtmidi/include seq_rtmidi/src Seqtool/src; do
+      substituteInPlace "$d/Makefile.am" --replace '$(git_info)' '${version}'
+    done
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    homepage = "https://github.com/ahlstromcj/seq66";
+    description = "Loop based midi sequencer with Qt GUI derived from seq24 and sequencer64";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ orivej ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 30889e14d570..246bcaa86889 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -22945,6 +22945,8 @@ in
 
   seq24 = callPackage ../applications/audio/seq24 { };
 
+  seq66 = qt5.callPackage ../applications/audio/seq66 { };
+
   setbfree = callPackage ../applications/audio/setbfree { };
 
   sfizz = callPackage ../applications/audio/sfizz { };