My Old Flame - Automatic Chord Sequence Analyser System

Automatic Chord Sequence Analyser System

Title: My Old Flame
Stated key: of G 4/4
Chord sequence: (use spaces or newlines to separate chords)

| Clear | Analyse dim/aug chords Remove duplicate chords Show additional data| Jazz standards library | Examples |

Listen in MIDI Main key: Am (confidence 121/114, minority 70%)

Degree:VIIbbVIIImVImImVIVIIVIVmIImVVVIVIImIIIVIIIVVIIVIbVIIImVImImVIVIIVIVmImVIIb
Source:GF7Bm7b5E7AmAm7b5D7GC7F7BbBbmAm7D7D7F7BbAm7b5D7G7C7F7D7A7D7GF7Bm7b5E7AmAm7b5D7GC7F7BbBbmAm7G
Key:AmAmAmAmAmAmGGFFFFGGGBbBbBbBbBbBbBbGGGGAmAmAmAmAmGGFFFFAmAm
Move:-1+3+2.5+2.50+2.5+2.5+2.5+2.5+2.50-0.5+2.50+1.5+2.5-0.5+2.5+2.5+2.5+2.5-1.5-2.5+2.5+2.5-1+3+2.5+2.50+2.5+2.5+2.5+2.5+2.50-0.5-1
Common:G,H,DF,A,C,EbH,D,F,AE,Ab,H,DA,C,EA,C,Eb,GD,F#,A,CG,H,DC,E,G,BbF,A,C,EbBb,D,FBb,Db,FA,C,E,GD,F#,A,CD,F#,A,CF,A,C,EbBb,D,FA,C,Eb,GD,Gb,A,CG,H,D,FC,E,G,BbF,A,C,EbD,F#,A,CA,C#,E,GD,F#,A,CG,H,DF,A,C,EbH,D,F,AE,Ab,H,DA,C,EA,C,Eb,GD,F#,A,CG,H,DC,E,G,BbF,A,C,EbBb,D,FBb,Db,FA,C,E,GG,H,D
N:123456789101112131415161718192021222324252627282930313233343536373839

Statistics of detected keys:
KeyConfidenceGuessesFixed keyChordsMinority
C (Am)
121
12 (31%)
13 (33%)
10 (26%)
7 (70%)
Main key
F
114
10 (26%)
8 (21%)
6 (15%)
0 (0%)
Second possible key
G
112
16 (41%)
11 (28%)
6 (15%)
0 (0%)
Bb
111
12 (31%)
7 (18%)
3 (8%)
0 (0%)
D (Hm)
93
6 (15%)
0 (0%)
9 (23%)
2 (22%)
Eb
87
3 (8%)
0 (0%)
0 (0%)
0 (0%)
A
72
2 (5%)
0 (0%)
1 (3%)
0 (0%)
Ab
70
2 (5%)
0 (0%)
0 (0%)
0 (0%)
Db (Bbm)
62
2 (5%)
0 (0%)
2 (5%)
2 (100%)
E
61
0 (0%)
0 (0%)
2 (5%)
0 (0%)
Gb
51
2 (5%)
0 (0%)
0 (0%)
0 (0%)
H
46
0 (0%)
0 (0%)
0 (0%)
0 (0%)


Key - shows the key detected for the position. Algoritm tries to detect minor keys based on occurence of minor tonic keys in the part.

Pink chord background - shows chords, that do not interact with the previous line and form new key

Degree - shows the degree of chord over the detected key

Guesses - shows the possible keys in the position, taking previous chords into account. Guesses are always major. If there is more then one possibility, algorithm will not show it in the Key row. Those selected for ultimate keys are green

Local - shows all possible keys for the chord, without taking previous chords into account.

SLocal - shows most probable keys for the position, considering several chords before and after it

Minority - probability of the current key being minor (calculated based on surrounding chords statistic)

Move - shows how many whole tones the key jumps to the next chord:
0Same base key. e.g. C -> Cm
+0.5 or -0.5Chromatic movement. e.g. C -> C#dim
+1,5 or +2 or -1,5 or -2Mediant movement. e.g. Em -> Ab
+2.5Classic resolving V -> I. e.g. G -> C
-2.5Rock resolving IV -> I. e.g. F -> C
+3Tritone movement. e.g. H -> F
1, 1.5 and 2 jumps are not colored

KMove - shows how many whole tones the key jumps to the next key

Common - shows notes of the current chord, highlighting notes, that are common with the next chord

MDiss - shows notes of the current chord, which dissonate with diatonic of the Main key

Diss - shows notes of the current chord, which dissonate with diatonic of the current key

Mouse over the table to see additional information


The algorithm knows Bb and H notes. B is interpreted as H, not Bb!

Example: F-7 Bb-7 Eb7 Abmaj7 Dbmaj7 D-7 G7 Cmaj7 C-7 F-7 Bb7 Ebmaj7 Abmaj7 A-7 D7 Gmaj7 A-7 D7 Gmaj7 F#-7 H7 Emaj7 F-7 Bb-7 Eb7 Abmaj7 Dbmaj7 Db-6 C-7 Hdim Bb-7 Eb7 Abmaj7

You can use following chords: m (minor), - (dorian), 7 (sept), maj7 (major 7), dim (diminished), m7b5 (half diminished), aug or + (augmented), b9 (contains b9)

If you want to use sixth notes, use chord inversions instead. e.g. Am7 instead of C6, or Hm7b5 instead of D-6

2011 Copyright by Alexey Arkhipenko. Please feel free to write me feedback: rualark at google mail (gmail.com)

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