Re: Phrygian Mode
Well, the terms "major" and "minor" are the traditional terms to decribe if the interval spacing is a 1/2 step, or a full step, apart. It's sounds more complex than it really is.
A minor chord is simply a triad (made up of stacked thirds) with a minor third. This means that the interval space between the 2nd and the third interval is a 1/2 step.
A regular major chord has a major third, meaning the interval space between the 2nd and the third is a full step.
A 7th chord has an additional third stacked onto the existing triad, and is a 4 note chord, instead of a three note chord (a 9th chord has 5 stacked thirds, an 11th chord 6 stacked thirds, and so on...).
A regular major chord with the additional 7th added is simply called a 7th chord. For example, G7. It's never called G major 7th chord, or a G minor 7th, as this would cause confusion with G chords that are very different sounding, and possibly related to a different key or mode.
The interval spacing from the sixth to the 7th interval, when you add a 7th to a regular triad is actuall only a 1/2 step, or a minor interval, but you mustn't name it a minor 7th chord, because it would not discriminate between the use of a major or minor third.
A Gmin7 is actually a G minor triad with the same minor 7th interval added.
A Gmaj7 is actually a regular G major triad (with a major third) but the 7th is raised a 1/2 step to match the interval spacing of regular major scales.
The use of particular 7th chords is closely related to the key or mode your playing in, and the required interval spacing. The same applies to modes.
IMO, The best way for most electric guitarists to use modes, and keep track of modes and other key related complexities, is to use the blues scale(pentatonic minor) as the foundation of everything, and add certian notes, or retract certian notes, from that.
Jimi Hendrix never had any formal training, but was the absolute master of instictively incorporating modes, and complex chord voicings into his playing. Many players that we think of using mostly simplistic pentatonic scales, and a very simplist approach, are actually very good at this, because the blues scale lends it's self as very flexable base.