Does anyone here understand the concept of musical modes? Does much of "our kind of music" involve this sort of thing? Do I need to "know" it?

Pasted from Wikipedia:

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4 Modern

    * 4.1 Modern modal scales on the natural notes
          o 4.1.1 Ionian (I)
          o 4.1.2 Dorian (II)
          o 4.1.3 Phrygian (III)
          o 4.1.4 Lydian (IV)
          o 4.1.5 Mixolydian (V)
          o 4.1.6 Aeolian (VI)
          o 4.1.7 Locrian (VII)

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