The
dorian mode is built from the second degree of a major scale.
It is a commonly-used mode in rock and jazz because it has
a relatively bright sound for a minor mode.
Example: C major scale: C D E F G A
B C D
D dorian mode: D E F G A B C D
D major scale (for comparison
to D dorian):
D E F# G A B C# D
What's in it:
The dorian mode has a b3 and a b7 (F
and C instead of F# and C#, when compared to D major
scale).