Minor seventh
Ten semitones. Wide and a little unstable; it is the interval that names the dominant seventh chord.
10 semitones Symbol m7 Mild dissonance
Listen
See
C
E
B m7
G
D 0
A
E
0 1234567
C → B♭
Where you have heard it
Ascending
Somewhere (West Side Story) the first two notes
Star Trek original theme
Descending
An American in Paris opening theme
Watermelon Man riff
What it gets confused with
Frequently asked
How many semitones is a minor seventh?
Ten, for example between C and B flat.
How do I recognise it by ear?
It opens "Somewhere" from West Side Story and the original Star Trek theme — a wide leap that leans forward.
Where does it show up in harmony?
It is the seventh of the dominant seventh chord. That is the interval doing the pulling when a V chord resolves.
There is an exercise track dedicated to recognising this by ear.
Train this