diff --git a/pytheory/_statics.py b/pytheory/_statics.py
index 46d3c5c..6e39f4b 100644
--- a/pytheory/_statics.py
+++ b/pytheory/_statics.py
@@ -49,7 +49,7 @@ SCALES = {
                 "major": {"major": True, "hemitonic": True},
                 "minor": {"minor": True, "hemitonic": True},
                 "harmonic minor": {"minor": True, "harmonic": True, "hemitonic": True},
-                "melodic minor": {"minor": True, "melodic": True, "hemitonic": True},
+                # "melodic minor": {"minor": True, "melodic": True, "hemitonic": True},
             },
         ],
         # TODO: understand this
@@ -69,6 +69,8 @@ SCALES = {
     }
 }
 
+SYSTEMS = NotImplemented
+
 for i, (degree_name, modes) in enumerate(DEGREES["western"]):
     for mode in modes:
         SCALES[12]["heptatonic"][1].update(
diff --git a/pytheory/core.py b/pytheory/core.py
index 0fb28f5..a49f51d 100644
--- a/pytheory/core.py
+++ b/pytheory/core.py
@@ -1,13 +1,7 @@
 from math import ceil, floor
 import numeral
 
-from ._statics import REFERENCE_A, TEMPERAMENTS, TONES, DEGREES, SCALES
-
-
-class Pitch:
-    def __init__(self, *, frequency):
-        self.frequency = frequency
-
+from ._statics import REFERENCE_A, TEMPERAMENTS, TONES, DEGREES, SCALES, SYSTEMS
 
 class Tone:
     # __slots__ = ("name", "octave", "system")