#3
Learn the major scale PROPERLY.
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#4
Quote by Zaphod_Beeblebr
Learn the major scale PROPERLY.

+1

this and only this...have a read of Josh Urban's Crusade articles to get you started, they're in the columns section.
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#5
Minor pentatonic is the obvious one

but everything derives from the major scale, learn that good and youve good a great start.
#6
The Major scale, the pentatonic... maybe the harmonic minor, but only if you master the Major and Pentatonic scales PROPERLY.