21 Guns – Intro
21 Guns – Verse
21 Guns – Chorus
21 Guns – Bridge
21 Guns – Solo
Related Music Concepts
Basic Chords
Chords naturally found in the key
Inverted Chords
Using a different bass note to change a chord's sound
Bassline Motion
How much the bass moves stepwise between chord roots
Borrowed Chords
Using chords from parallel modes for contrast and emotion
Secondary Chords
Chords that temporarily shift the harmonic center
Song Stats
●
Key
D Minor
Tempo
71 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
D4 – A4
Mood
Smooth, Simple, Classic, Mellow, Moody
Most Used Chord
i
Chord Complexity
24
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
24
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
0
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
10
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Concepts
Song Stats
●
Key
D Minor
Tempo
79 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
D3 – D4
Mood
Classic, Mellow, Moody
Most Used Chord
VI
Chord Complexity
26
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
62
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
41
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
10
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Concepts
Song Stats
●
Key
F Major
Tempo
82 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
F3 – F4
Mood
Simple, Classic, Bright
Most Used Chord
V
Chord Complexity
15
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
51
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
56
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
12
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Concepts
Song Stats
●
Key
D Minor
Tempo
83 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
G3 – F4
Mood
Moody
Most Used Chord
VI
Chord Complexity
42
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
84
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
40
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
23
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Concepts
Song Stats
●
Key
F Major
Tempo
83 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
A#2 – E5
Mood
Smooth, Simple, Bright
Most Used Chord
V
Chord Complexity
19
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
76
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
15
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
25
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Song Stats
●
Tempo
71 BPM
Meter
4/4
Genre
Rock, Pop, Punk
Melody Range
A#2 – E5
Mood
Smooth, Simple, Classic, Mellow, Moody
Most Used Chord
V
Chord Complexity
24
Chord Complexity: Tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
65
Melodic Complexity: Reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
23
Chord-Melody Tension: Quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Prog. Novelty
13
Chord Prog. Novelty: Measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
About 21 Guns
About the Key
D Minor
It is the 4th most popular key among Minor keys and the 10th most popular among all keys. Minor keys, along with major keys, are a common choice for popular music.
i iv VI
Most Important Chords
The three most important chords, built off the 1st, 4th and 5th scale degrees are all minor chords (D minor, G minor, and A minor).
D Minor Cheat Sheet
Popular chords, progressions, downloadable MIDI files and more
About the Chord Progressions
About the Melody
Melody data is compiled from all analyzed melody sections, so depending on how a user analyzed a song, "melody" might include instrumental notes.
A#2 – E5
Melody range across 30 semitones
0.92 beats/note
Across 200.0 beats of melody
Stepwise Motion
Jumpiness
Repeaty
98%
Diatonic
Percentage of notes within the song's key.
64%
Chord Tones
Percentage of notes that fall on a chord tone of the underlying harmony.
Mixed
Consonance
How smoothly the melody blends with the harmony (0 = dissonant, 1 = consonant).
Loose
Syncopation
How often the melody emphasizes off-beats. Higher = more syncopated.
About the Metrics
Chord Complexity
Chord Complexity tracks when a song goes beyond simple three-note chords—either by adding extra tones (like 7ths or add9s) or by borrowing notes from outside the key—creating richer, more sophisticated harmonies.
Melodic Complexity
Melodic Complexity reflects two factors: the use of notes outside the key and rhythmic syncopation, together capturing how intricate or surprising a melody feels.
Chord-Melody Tension
Chord-Melody Tension quantifies how often melody notes fall outside the current chord, producing dissonance that creates a sense of instability.
Chord Progression Novelty
Chord Progression Novelty measures how uncommon a song's chord changes are compared to others in the Hooktheory database, highlighting progressions that deviate from typical patterns.
Chord-Bass Melody
Chord–Bass Melody evaluates how smoothly the bass moves between chords, scoring higher when it travels step-wise, ascending or descending, instead of jumping directly between root position chords.
Hooktheory's metrics are calculated against the entire database of analyzed songs, where 50 is the "average song." Learn more about each of these metrics here.
Chord Complexity
24
Measures how diverse and sophisticated the chord vocabulary is in this song.
Percentile: 24/100 — below average
Melodic Complexity
65
Measures the range, intervallic variety, and rhythmic complexity of the melody.
Percentile: 65/100 — above average
Chord-Melody Tension
23
Measures how much the melody notes clash or harmonize with the underlying chords.
Percentile: 23/100 — below average
Chord Prog. Novelty
13
Measures how unusual or unexpected the chord progressions are compared to common patterns.
Percentile: 13/100 — below average
Chord-Bass Melody
83
Measures the melodic movement of the bass notes across chord changes.
Percentile: 83/100 — above average
Song Data
Metrics Radar Chart
21 GunsAverage Song
BPM Comparison
Melody Distribution
1
2
3
4
5
6
7
Melodic Intervals
Distribution of note-to-note jumps in semitones (negative = downward, positive = upward)
Note Durations
How long each note is held (in beats)
Syncopation
How many notes fall on each level of metric strength (0 = on-beat, higher = increasingly off-beat)
Level 0
Notes that fall on the downbeat — the strongest metric position in the measure.
Level 1
Notes on a secondary strong beat (e.g. beat 3 in 4/4) — still firmly on the grid.
Level 2
Notes on the remaining primary beats (2 and 4 in 4/4) — moderate metric weight.
Level 3
Notes on eighth-note offbeats — between the primary beats. Audibly syncopated.
