diff --git a/patacrep/songs/chordpro/ast.py b/patacrep/songs/chordpro/ast.py
index 178e09ba..5cffbb86 100644
--- a/patacrep/songs/chordpro/ast.py
+++ b/patacrep/songs/chordpro/ast.py
@@ -145,24 +145,9 @@ class Chord(AST):
 
     _template = "chord"
 
-    def __init__(
-            self,
-            key,
-            alteration=None,
-            modifier=None,
-            addnote=None,
-            basskey=None,
-            bassalteration=None,
-            star=None,
-        ):
+    def __init__(self, chord):
         # pylint: disable=too-many-arguments
-        self.key = key
-        self.alteration = alteration
-        self.modifier = modifier
-        self.addnote = addnote
-        self.basskey = basskey
-        self.bassalteration = bassalteration
-        self.star = star
+        self.chord = chord
 
 class Verse(AST):
     """A verse (or bridge, or chorus)"""
diff --git a/patacrep/songs/chordpro/data/chordpro/content_chord b/patacrep/songs/chordpro/data/chordpro/content_chord
index 99e0d4c4..7d5ec6ca 100644
--- a/patacrep/songs/chordpro/data/chordpro/content_chord
+++ b/patacrep/songs/chordpro/data/chordpro/content_chord
@@ -1,10 +1 @@
-((- content.key -))
-(* if content.alteration *)(( content.alteration ))(* endif -*)
-(* if content.modifier *)((content.modifier))(* endif -*)
-(* if content.addnote *)((content.addnote))(* endif -*)
-(* if content.basskey -*)
-    /
-    ((- content.basskey -))
-    (* if content.bassalteration *)(( content.bassalteration ))(* endif -*)
-(* if content.star *)*(* endif -*)
-(* endif -*)
+((- content.chord -))
diff --git a/patacrep/songs/chordpro/data/latex/content_chord b/patacrep/songs/chordpro/data/latex/content_chord
index 406b75fe..61b51c8a 100644
--- a/patacrep/songs/chordpro/data/latex/content_chord
+++ b/patacrep/songs/chordpro/data/latex/content_chord
@@ -1,12 +1 @@
-((- content.key -))
-(* if content.alteration == '#' *)#(* endif -*)
-(* if content.alteration == 'b' *)&(* endif -*)
-(* if content.modifier *)((content.modifier))(* endif -*)
-(* if content.addnote *)((content.addnote))(* endif -*)
-(* if content.basskey -*)
-    /
-    ((- content.basskey -))
-    (* if content.bassalteration == '#' *)#(* endif -*)
-    (* if content.bassalteration == 'b' *)&(* endif -*)
-(* if content.star *)*(* endif -*)
-(* endif -*)
+((- content.chord|replace("b", "&") -))
diff --git a/patacrep/songs/chordpro/lexer.py b/patacrep/songs/chordpro/lexer.py
index 6d47bea8..aba37a1c 100644
--- a/patacrep/songs/chordpro/lexer.py
+++ b/patacrep/songs/chordpro/lexer.py
@@ -39,7 +39,7 @@ class ChordProLexer:
 
     t_SPACE = r'[ \t]+'
 
-    t_chord_CHORD = r'[A-G#bmajdisus+*2-9/ ]+'
+    t_chord_CHORD = r'[^\]]+'
 
     t_directive_SPACE = r'[ \t]+'
     t_directive_KEYWORD = r'[a-zA-Z_]+'
diff --git a/patacrep/songs/chordpro/syntax.py b/patacrep/songs/chordpro/syntax.py
index 89264f68..80baf66f 100644
--- a/patacrep/songs/chordpro/syntax.py
+++ b/patacrep/songs/chordpro/syntax.py
@@ -7,24 +7,6 @@ from patacrep.songs.syntax import Parser
 from patacrep.songs.chordpro import ast
 from patacrep.songs.chordpro.lexer import tokens, ChordProLexer
 
-CHORD_RE = re.compile(
-    r"""
-        ^
-        (?P<key>[A-G])
-        (?P<alteration>[b#])?
-        (?P<modifier>(maj|sus|dim|m|\+))?
-        (?P<addnote>[2-9])?
-        (
-            /
-            (?P<basskey>[A-G])
-            (?P<bassalteration>[b#])?
-        )?
-        (?P<star>\*)?
-        $
-    """,
-    re.VERBOSE
-    )
-
 class ChordproParser(Parser):
     """ChordPro parser class"""
     # pylint: disable=too-many-public-methods
@@ -69,17 +51,17 @@ class ChordproParser(Parser):
         """
         symbols[0] = None
 
-    def _parse_define(self, groups, *, symbols):
+    @staticmethod
+    def _parse_define(groups):
         """Parse a `{define: KEY base-fret BASE frets FRETS fingers FINGERS}` directive
 
         Return a :class:`ast.Define` object.
         """
         # pylint: disable=too-many-branches
-        key = list(self._parse_chords(groups['key'], symbols=symbols))
-        if len(key) != 1:
+        if not groups['key'].strip():
             return None
         else:
-            key = key[0]
+            key = ast.Chord(groups['key'].strip())
 
         if groups['basefret'] is None:
             basefret = None
@@ -151,7 +133,7 @@ class ChordproParser(Parser):
                 symbols[0] = ast.Error()
                 return
 
-            symbols[0] = self._parse_define(match.groupdict(), symbols=symbols)
+            symbols[0] = self._parse_define(match.groupdict())
             if symbols[0] is None:
                 self.error(
                     line=symbols.lexer.lineno,
@@ -207,24 +189,10 @@ class ChordproParser(Parser):
         """space : SPACE"""
         symbols[0] = ast.Space()
 
-    def _parse_chords(self, string, *, symbols):
-        """Parse a list of chords.
-
-        Iterate over :class:`ast.Chord` objects.
-        """
-        for chord in string.split():
-            match = CHORD_RE.match(chord)
-            if match is None:
-                self.error(
-                    line=symbols.lexer.lineno,
-                    message="Invalid chord '{}'.".format(chord),
-                    )
-                continue
-            yield ast.Chord(**match.groupdict())
-
-    def p_chord(self, symbols):
+    @staticmethod
+    def p_chord(symbols):
         """chord : CHORD"""
-        symbols[0] = ast.ChordList(*list(self._parse_chords(symbols[1], symbols=symbols)))
+        symbols[0] = ast.ChordList(*[ast.Chord(chord) for chord in symbols[1].split()])
 
     @staticmethod
     def p_chorus(symbols):
diff --git a/patacrep/songs/chordpro/test/invalid_chord.sgc b/patacrep/songs/chordpro/test/invalid_chord.sgc
index 2a17e6e7..7ec4fd65 100644
--- a/patacrep/songs/chordpro/test/invalid_chord.sgc
+++ b/patacrep/songs/chordpro/test/invalid_chord.sgc
@@ -2,6 +2,4 @@
 
 {start_of_verse}
     This is  invalid.
-    This [A]too.
-    And []as well.
 {end_of_verse}
diff --git a/patacrep/songs/chordpro/test/invalid_chord.source b/patacrep/songs/chordpro/test/invalid_chord.source
index 7df0d1f9..0e63a90b 100644
--- a/patacrep/songs/chordpro/test/invalid_chord.source
+++ b/patacrep/songs/chordpro/test/invalid_chord.source
@@ -1,3 +1 @@
-This is [H] invalid.
-This [A@]too.
-And [Amm]as well.
+This is [] invalid.
diff --git a/patacrep/songs/chordpro/test/invalid_chord.tex b/patacrep/songs/chordpro/test/invalid_chord.tex
index 8e874988..476d776a 100644
--- a/patacrep/songs/chordpro/test/invalid_chord.tex
+++ b/patacrep/songs/chordpro/test/invalid_chord.tex
@@ -8,8 +8,6 @@
 
 \begin{verse}
     This is  invalid.
-    This \[A]too.
-    And as well.
 \end{verse}
 
 \endsong
diff --git a/patacrep/songs/chordpro/test/invalid_customchord.source b/patacrep/songs/chordpro/test/invalid_customchord.source
index 9754318f..d0baf679 100644
--- a/patacrep/songs/chordpro/test/invalid_customchord.source
+++ b/patacrep/songs/chordpro/test/invalid_customchord.source
@@ -1,5 +1,5 @@
 {define : }
-{define: H base-fret 7 frets 0 1 3 3 x x}
-{define: E4 base-fret H frets 0 1 3 3 x x}
-{define: E4 base-fret 7 frets 0 1 3 3 x A}
+{define: base-fret 7 frets 0 1 3 3 x x}
+{define: E4 base-fret frets 0 1 3 3 x x}
+{define: E4 base-fret H frets 0 1 3 3 x A}
 {define: E5 base-fret 7 frets 0 1 3 3 x x fingers - 1 2 3 - A}