From aaa3e53c4129345f5fc46cc6ecf131e4af204f01 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Thu, 26 Sep 2013 21:32:30 -0700
Subject: [PATCH] Add voicings for 7th chords without 3rd and without 5th

This does introduce a few more ambiguities. I need to write a mode
soon to search out and print all the ambiguous chords.
---
 scherzo.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/scherzo.c b/scherzo.c
index b0a6414..95890bc 100644
--- a/scherzo.c
+++ b/scherzo.c
@@ -665,13 +665,29 @@ scherzo_analyze_chord (scherzo_t *scherzo)
 #define SUP "<span font='33' rise='30000'>"
 #define PUS "</span>"
 
-    struct { modified_degree_t degrees[3]; const char *name; } triads[] = {
+    struct { modified_degree_t degrees[3]; const char *name; } trichords[] = {
+	/* Triads */
 	{ {{1, 0}, {3, +1}, {5,  0}}, "sus" },
 	{ {{1, 0}, {3,  0}, {5, +1}}, SUP "+" PUS },
 	{ {{1, 0}, {3,  0}, {5,  0}}, "" },
 	{ {{1, 0}, {3, -1}, {5,  0}}, "m" },
 	{ {{1, 0}, {3, -1}, {5, -1}}, "°" },
-	{ {{1, 0}, {2,  0}, {5,  0}}, "msus2" }
+	{ {{1, 0}, {2,  0}, {5,  0}}, "msus2" },
+	/* Seventh chords with no 3rd */
+	{ {{1, 0}, {5, +1}, {7,  0}}, SUP "+M7" PUS },
+	{ {{1, 0}, {5, +1}, {7, -1}}, SUP "+7" PUS },
+	{ {{1, 0}, {5,  0}, {7,  0}}, "M7" },
+	{ {{1, 0}, {5,  0}, {7, -1}}, "7" },
+	{ {{1, 0}, {5, -1}, {7, -1}}, "7♭5" },
+	/* Seventh chords with no 5th */
+	{ {{1, 0}, {4,  0}, {7,  0}}, "M7sus" },
+	{ {{1, 0}, {4,  0}, {7, -1}}, "7sus" },
+	{ {{1, 0}, {3,  0}, {7,  0}}, "M7" },
+	{ {{1, 0}, {3,  0}, {7, -1}}, "7" },
+	{ {{1, 0}, {3, -1}, {7,  0}}, "m" SUP "M7" PUS },
+	{ {{1, 0}, {3, -1}, {7, -1}}, "m7" },
+	{ {{1, 0}, {2,  0}, {7,  0}}, "m" SUP "M7" PUS "sus2" },
+	{ {{1, 0}, {2,  0}, {7, -1}}, "m7sus2" },
     };
 
     struct { modified_degree_t degrees[4]; const char *name; } tetrachords[] = {
@@ -849,12 +865,12 @@ scherzo_analyze_chord (scherzo_t *scherzo)
 	    }
 	    break;
 	case 3:
-	    for (i = 0; i < ARRAY_SIZE (triads); i++) {
+	    for (i = 0; i < ARRAY_SIZE (trichords); i++) {
 		if (_chord_signature_matches (notes, num_notes,
-					      triads[i].degrees, 3,
+					      trichords[i].degrees, 3,
 					      inversion, &root))
 		{
-		    chord_name = triads[i].name;
+		    chord_name = trichords[i].name;
 		    goto CHORD_NAME_KNOWN;
 		}
 	    }
-- 
2.43.0