A mode is a type of scale, and you probably already know at least two - the major scale is known as Ionian mode in mode-speak, while the natural minor scale is known as Aeolian mode. But what notes do we use to build them?
Essentially, the thing that determines one mode from another is the pattern of intervals between the notes.
An easy way to generate all seven major scale modes is to start with the scale of C major. Play this as you normally would, from C to C on the keyboard, and you get the Ionian mode. Start from any other note, however, and you’ll generate a different pattern of intervals with a different sound, and hence a different mode.
Playing the notes in the C major scale from D to D results in the Dorian mode, E to E gives you Phrygian mode, and so on, as illustrated in the chart below.
Broadly speaking, the modes can be split into two main categories – major modes and minor modes - depending on whether they contain a major or minor 3rd, and each mode has a particular type of chord that it can be used over the top of for best results.
More on modes
Kind of a ‘bonus’ mode, Lydian Dominant is formed by merging together Lydian and Mixolydian modes to produce the equivalent of a major scale with a raised 4th and a flattened 7th.
Lydian Dominant is a great alternative to Mixolydian when used over dominant 7th chords, and can also be used over standard major triads as long as you avoid playing the major 7th over it!
What differentiates a mode is what differentiates any other scale - the pattern of intervals between the notes. As with any scale, it doesn’t really matter if you can’t remember it... or even play it for that matter! Just Google the intervallic formula and either step program it into your DAWs piano roll editor or, if your DAW supports it, select the preset for the desired mode in the Scale Lock/Quantize feature. Even some arpeggiators, such as Logic Pro X’s, support modes.
Locrian - the odd mode out
The 7th mode, Locrian, is the only mode that can’t be played over a power chord made up of root and 5th, as it has a flattened 5th, which would create a discordant semitone clash. All other six modes contain a natural 5th, so the dark, tricky-to-use Locrian is a bit of a black sheep.
Order of brightness
Each mode has its own identity and tone, and they can be listed from happy to moody. If you want a mode to suit a particular mood or convey a certain emotion, use this order of brightness as your guide.