diff --git a/pytheory/bootstrap.py b/pytheory/bootstrap.py
deleted file mode 100644
index 8812cff..0000000
--- a/pytheory/bootstrap.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from .tones import Tone
-# SYSTEMS = {"western": System(tones=TONES["western"], degrees=DEGREES["western"])}
-
-def SYSTEMS(SYSTEMS, DEGREES, TONES, System):
-    western_tones = [Tone.from_string(t) for t in TONES["western"]]
-    SYSTEMS = {"western": System(tones=western_tones, degrees=DEGREES["western"])}
-    return SYSTEMS
diff --git a/pytheory/charts.py b/pytheory/charts.py
new file mode 100644
index 0000000..b538cb3
--- /dev/null
+++ b/pytheory/charts.py
@@ -0,0 +1,79 @@
+import itertools
+
+from .systems import SYSTEMS
+from .tones import Tone
+
+MODS = ('', 'm', '5', '7', '9', 'dim', 'm6', 'm7', 'maj7', 'sus')
+
+CHARTS = {}
+CHARTS['western'] = []
+
+class NamedChord:
+    def __init__(self, *, tone_name, mod):
+        self.tone_name = tone_name
+        self.mod = mod
+
+    @property
+    def name(self):
+        return f"{self.tone_name}{self.mod}"
+
+    @property
+    def tone(self):
+        return Tone(name=self.tone_name)
+
+    def __repr__(self):
+        return f"<NamedChord name={self.name!r}>"
+
+    @property
+    def acceptable_tones(self):
+        acceptable = [self.tone]
+
+        acceptable += [self.tone.add(5)]
+        # acceptable += [self.tone.add(3)]
+        acceptable += [self.tone.subtract(5)]
+        # acceptable += [self.tone.subtract(3)]
+
+        return tuple(acceptable)
+
+    @property
+    def acceptable_tone_names(self):
+        return tuple([tone.name for tone in self.acceptable_tones])
+
+    def possible_fingerings(self, *, fretboard):
+        def find_fingerings(tone):
+            fingerings = []
+            for j in range(7):
+                fingered_tone = tone.add(j)
+                for acceptable_tone in self.acceptable_tones:
+                    if fingered_tone.name == acceptable_tone:
+                        fingerings.append(j)
+
+            return tuple(fingerings)
+
+        fingering = []
+        for i, tone in enumerate(fretboard.tones):
+            fingering.append(find_fingerings(tone))
+        return tuple(fingering)
+
+    def fingerings(self, *, fretboard):
+        return tuple(itertools.product(*self.possible_fingerings(fretboard=fretboard)))
+
+    def fingering(self, *, freboard):
+        possible_fingerings = self.possible_fingerings(freboard=fretboard)
+        return posible_fingerings
+
+
+
+western_chart = {}
+for tone_titles in SYSTEMS['western'].tone_names:
+    # Take the second tone name, if it's available.
+    if len(tone_titles) == 2:
+        tone_name = tone_titles[1]
+    else:
+        tone_name = tone_titles[0]
+
+    for mod in MODS:
+        named_chord = NamedChord(tone_name=tone_name, mod=mod)
+        western_chart.update({f"{tone_name}{mod}": named_chord})
+
+CHARTS['western'] = western_chart
diff --git a/pytheory/core.py b/pytheory/core.py
index ec37d7e..efec25d 100644
--- a/pytheory/core.py
+++ b/pytheory/core.py
@@ -4,3 +4,4 @@ from .tones import Tone
 from .systems import System, SYSTEMS
 from .scales import Scale, TonedScale
 from .chords import Chord, Fretboard
+from .charts import CHARTS
diff --git a/pytheory/systems.py b/pytheory/systems.py
index 59bf466..53973f4 100644
--- a/pytheory/systems.py
+++ b/pytheory/systems.py
@@ -1,5 +1,4 @@
 from ._statics import TEMPERAMENTS, TONES, DEGREES, SCALES, SYSTEMS
-from . import bootstrap
 
 
 class System:
diff --git a/pytheory/tones.py b/pytheory/tones.py
index 169f98b..5725d50 100644
--- a/pytheory/tones.py
+++ b/pytheory/tones.py
@@ -79,6 +79,8 @@ class Tone:
     def _math(self, interval):
         """Returns (new index, new octave)."""
 
+        octave = self.octave or 0
+
         try:
             mod = len(self.system.tones)
         except AttributeError:
@@ -87,7 +89,7 @@ class Tone:
             )
         result = self._index + interval
         index = result % mod
-        octave = result // mod + self.octave
+        octave = result // mod + octave
         return (index, octave)
 
     def add(self, interval):