A mode is a scale built by starting on a different note of the same set of notes. Play only the white keys from C to C and you hear C major (Ionian). Play white keys from D to D and you hear D Dorian: same notes, different home base, completely different feel.
The seven modes
| Mode | Starts on | Character |
|---|---|---|
| Ionian (major) | 1st | bright, stable, resolved |
| Dorian | 2nd | minor but hopeful, jazzy, funky |
| Phrygian | 3rd | dark, tense, Spanish or metal |
| Lydian | 4th | dreamy, floating, wonder |
| Mixolydian | 5th | bluesy major, rock, laid back |
| Aeolian (natural minor) | 6th | sad, serious, emotional |
| Locrian | 7th | unstable, dissonant, unresolved |
Why they sound different
Your ear hears everything relative to the root. Move the root and the same notes now sit at different distances from it, so the pattern of whole and half steps changes. That pattern is the mode’s identity, and it is the reason a Phrygian riff sounds menacing: the second note is only a semitone above the root.
Hear it yourself
Open the explorer, keep the root fixed and switch modes. Listening with the same root is the fastest way to learn what each mode feels like.