.adding on...here's something which I often refer to (while giving you a bit of a background on modes)
A lot of traditional music, especially Scottish and Irish is termed
'Modal' because it does not follow the
conventional modern major or minor scales. It is often in the Mixolydian or Dorian mode.
Modes are simply the name given to the pattern of intervals between
each note in an octave i.e the ways of ordering a scale.
Modes and Scales can be traced back to Greek origins, where different tribes evolved different scales.
The scales ran down from a tonic note (rather than up which is the modern method) and maintained
certain intervals between notes.
Two of the scales gave rise to the modern major and modern minor scales (see table below).
Each scale started on a different note and
descended by characteristic intervals.
In the middle ages, the church adopted these scales, made them
ascending from a tonic note and
renamed them modes.
The Greek scales (and medieval modes) used only the natural notes (no sharps or flats)
which are equivalent to the white notes of a piano. This gives a characteristic interval
between notes in the scale (see individual modes). Providing these intervals are maintained
for a given mode, they can in modern music start on any note (including sharps and flats).
That's more or less just the tip of the ice-berg, have fun with that, great for creating cool riffs and raffs and stuff, I pretty much refer to certain modes almost all the time in some productions Im apart of. Hope that helps man.
*edit: sorry for the crazy sized images, Im on a sucky computer