QUOTE (maharzan @ Dec 16 2009, 12:45 AM)

If you play 1, 3, 5, 7 position in the chord separately, its an arpeggio!!!!......... Did I get that right?
yes, it's a maj7 arpeggio. When you stack 3rd on top of 3rd. If you do that with major scale you will get 1, 3, 5, 7
If you have maj3rd and normal(maj)7th then you call this maj7
In order to call something dominant, you need both maj3rd and b7th
Phrygian dominant is the same as phrigyan but with maj3rd respectively. This one comes from different mode family called
harmonic minor scale. that scale is the root scale (like ionian in normal major scale modes) and you count modes from there. Phrigyan dominant is the 5th mode of harmonic minor scale.
This is the list that can help you for now:
Ionian - major mode (because has maj3rd)
Dorian - minor mode (because has min3rd)
Phrygian - minor mode
Lydian - major mode
Mixolydian - major mode
Aeolian - minor mode
Locrian - minor mode (exception)
The last one is just a passing one (tends to resolve somewhere), you will never play that over any other chord apart from m7b5.
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Now other mode families

Their names are as follows: (but you might find other names as well)
HARMONIC MINOR SCALE (this is a must in neoclassical style)
1) Aeolian #7 (Harmonic Minor) - A B C D E F G# - AmMaj7 / you can also add (b6)
2) Locrian #6 - B C D E F G# A - Bm7b5
3) Ionian #5 - C D E F G# A B - Cmaj7#5
4) Dorian #4 - D E F G# A B C - Dm7 / you can also add (#11)
5) Phrygian #3 (Phrygian Dominant) - E F G# A B C D - E7 / you can also add (b9,b13)
6) Lydian #2 - F G# A B C D E - Fmaj7 / you can also add (#9)
7) Mixolydian #1 (Diminished) - G# A B C D E F - G#dim7
the last one people also call - Altered Dominant bb7
MELODIC MINOR SCALE (this one is used in jazz non-stop)
1. Ionian b3 (Melodic Minor)
2. Dorian b2
3. Phrygian "b1" (Lydian #5)
4. Lydian b7
5. Mixolydian b6
6. Aeolian b5
7. Locrian b4 (Superlocrian)