In various books I have seen mention of three different types of minor scale - natural, harmonic and, er, the other one. Is there any particular scale that guitarists should concentrate on, in particular?
Even more basic, perhaps, but what is the point of scales? I practise doing a version of the minor pentatonic and of the major scale, and I enjoy doing that, for the sake of coordination, but is there any other good reason to learn them? Is it just to be able to do a solo over chords...?